Description : OLS Non-return damper frame is constructed of high quality hot-dipped pre galvanised steel sheet of … 0000023570 00000 n Product SA - Search A-Z Find out quickly and simply. It is used for gravity ventilation and low velocity systems. 1887 34 0000013532 00000 n Item Number: 137405. That article stressed the impor-tance of properly locating, selecting, designing, and main-taining pressure-relief devices to ensure that they operate when their service is … 0000013998 00000 n 0000005051 00000 n %%EOF 1887 0 obj <> endobj Superior to single top pivot solutions, the DUX is a compact, extremely robust and efficient two way pressure relief vent, ideal for chemical gases. 0000014535 00000 n Non return / pressure relief dampers SG 661 Non return damper (duct mounted) SG 663 (wall mounted) DESCRIPTION CONSTRUCTION AG 661 SG 661 EG 661 SG 663 AG 663 EG 663 AVAILABLE OPTIONS s Belimo actuator, code M. s Brass / PVC bushes, code B1/B2. Contact us For further information. Pressure Relief Damper The Wozair Pressure Relief Damper (PRD) are a range of high integrity dampers that have been designed to meet the requirements of the offshore oil and gas and nuclear markets where corrosion resistance, mechanical integrity and performance are primary factors. Pressure relief damper is used to relieve built-up pressure in HVA system to prevent damage to other components, or to ållow press r Áfor e area to be regulated- to control air movement ohOmittinjÞthe two clo ng and counter 1. Pressure Relief Louver B - PRL-B. The Pressure Relief Damper can be modified to meet the requirements of specific clients specifications. Share page. Skip to content . 0000000998 00000 n Please complete the short contact form below, or alternatively fill out the full Damper Quote Request form with your specific requirements. PRESSURE RELIEF DAMPER - MODEL PRD Blades: 1.0mm thick extruded Aluminum profiles. Reliable. arms, as the weight of the edge pivoted blades is either added or subtracted from the weight necessary to hold blades closed. Wire Mesh Grille. Features of the PRD’s manufactured by PES include: Constructed out of Stainless Steel grade 304. Innovative. endstream endobj 1919 0 obj <>/Filter/FlateDecode/Index[52 1835]/Length 62/Size 1887/Type/XRef/W[1 1 1]>>stream www.safeair-dowco.com BRL … 0000003491 00000 n Construction Continuously Welded / Riveted; Linkage Parallel action; Minimum Module Size 200W x 200H x 300D mm; Maximum Module Size 2000W x 2000H x 300D mm ; Materials 304L (1.4307) / 316L (1.4404) Controls Weight Kit / Spring Balancing … attempting to modify HPR series pressure relief dampers for different damper orientations or start-to-open pressures. ARK2 For the prevention of excess pressure in rooms read more. of pressure-relief systems. Type UL/AUL/KUL read more. Counterbalance weights provide the ability to fine tune start-to-open and full-open operation. Grosvenor Road Backdraft and pressure relief dampers are available in galvanized steel, aluminum and 304 stainless steel. Model 1390CB is a counterbalanced backdraft damper designed for pressure relief to automatically … Counterbalance weights that can be set to relieve … Pressure Relief and Non Return Dampers. ARK2 Pressure relief dampers for gas fire extinguishing systems and transformer substations. 0000006117 00000 n Pressure Relief Damper with Wire Mesh Grille. Recommend this page. The damper is provided with bearings with gasket shaft seals only. BD-250 Round Pressure Relief Damper; BD-250-AL Round Butterfly Damper; … It is a mechanical damper with no electrical connections. Pressure relief dampers designed for horizontal flow (vertical mounting) are equipped with two sets of arms (see Figure 1). COUNTER WEIGHT Adjustable, on .063” aluminum bracket MAXIMUM VELOCITY & STATIC PRESSURE 2500 FPM @ 2” static pressure MAXIMUM TEMPERATURE 2500 F MAXIMUM SIZE Unlimited, with mullions, structural bracing supplied by others MAXIMUM SINGLE SECTION 48”W x 96”H MINIMUM SIZE 6”W x 14”H UNDERSIZED 1/4” (6.35) under ordered size unless specified Exact or Actual FINISH Mill … This louver are of air / pressure counter weight operated for opening and closing for intake or discharge or pressure relief, dampers lift automatically up there by relieving the excess pressure in the room and as the pressure drops back to normal the blades get closed by gravity or counter weight or spring. 0000003783 00000 n Flamgard Calidair Pressure Relief and Backdraft damper products are identical dampers, each can be fitted with an adjustable spring or counterweight system to suit the individual application of each product. ⇒ Pressure Relief Damper ® Designed to maintain designed pressure within a room. Pressure Relief Damper, Type KL-EM Automatic, dead-weight Pressure Relief Damper made of galvanized sheet (different material on request) steel with single damper blade on horizontal bearing. When all zones call, the pressure relief damper should be closed. The blade has a counter-balance weighted arm that can be adjusted to open when necessary. 3.Each damper comes from the factory with the correct number of counter-weights attached to the barometric When the pressure in the duct rises above selected value (from 30 Pa to 150 Pa, up to 300 Pa optionally) the damper blades open to allow pressure relief. Pressure you need is50 Pascal. 0000024389 00000 n Your Message. ASLI Pressure Relied Dampers (PRD) are designed to maintain certain amount of pressure in a pressurized zone (staircase, operation theatre, etc). Get contact details and address | … From light duty commercial applications to heavy duty industrial and process applications, Ruskin's comprehensive product portfolio includes high performance quality for every application. Counterbalance weights provide the ability to fine tune start-to-open and full-open operation. For higher opening pressure, contact Halton Marine. 0000025879 00000 n Pressure relief damper. The damper is provided with bearings with gasket shaft seals only. Pressure Relief Damper; Fire Damper; Smoke Damper; Fire & Smoke Damper; Collar Damper; Louvers. A Roof Mounted Supply Fan Is Shown, However the Fan May Be Located at Any Level. Data: Minimum size single module : 150 x 150mm : Maximum size single module : 900 x 1500mm: Operating Velocity : 10m/s: admin . Pressure Relief Damper-PRD; Download PDF Pressure Relief Damper-PRD Aluminium Construction - PRD. The Wozair Pressure Relief Damper (PRD) are a range of high integrity dampers that have been designed to meet the requirements of the offshore oil and gas and nuclear markets where corrosion resistance, mechanical integrity and performance are primary factors. <<57989D64FFF5774D8837367867579A27>]/Prev 302040/XRefStm 1346>> KUL. COUNTERBALANCED BACKDRAFT DAMPER HIGH PERFORMANCE • HEAVY DUTY STEEL FRAME • EXTRUDED ALUMINUM BLADES MODEL: 1390CB Nailor Industries Inc. reserves the right to change any information concerning product or pricing without notice. Productsearch A-Z Find out quickly and simply. It features: Extruded aluminum construction. The DUX is the world’s first double action two way pressure relief vent for halocarbon gases (pat applied) and provides a level of performance not otherwise available for this application. Pressure Relief Dampers. 0000009181 00000 n Non Return Dampers/Pressure Relief Dampers … Static Pressure Sensors Located Between the Stairwell and the Building. 0000019160 00000 n The CBD2 is an extremely sensitive gravity operated backdraft damper. Suitably size air pressure relief damper strategically placed, enable the differential room pressures to be maintained and ensure that there is sufficient air flow through the open door to prevent cross-contamination between clean and dirty areas when doors are opened. Our Partners Manufacturing Capacity . 3. 0000008051 00000 n No,but you can adjust the used weight on the pressure relief damper to match the required pressure that has to be maintained in the stair case which is50 Pa Upvote (0) Downvote (0) Reply (0) The minimum opening force can be adjusted with weights. 0000004589 00000 n 0000006723 00000 n 4-Reset the thermostats to the desired system set-tings. Weights are included in the delivery. 0000010962 00000 n When all zones call, the pressure relief damper should be closed. TROX Services. All Products. 0000035137 00000 n Suitably sized air pressure relief damper should be strategically placed, enabling differential room pressure to be maintained and ensure that when doors are opened between clean and dirty areas. Relocate the pressure relief damper counterweight to a point which keeps the damper blade closed without flutter. The PRD is used to relieve pressure through ventilation and duct systems. xref Three different). The release of this excess helps maintain or control the pressure in the zone, area or even inside the duct thus preventing the duct from damage. • Offset single blade design which lets Ruskin engineers calibrate the damper operation to exact customer specification. h���A 0ð48F}\Gcw��������z�C. 0000023939 00000 n An adjustable counter-weight is standard allowing the customer complete control in protecting his process system from over or under-pressure. Recommend this page by sending a link by mail. Counter weight design, complete with weight retainer for convenient of site adjustment. Non Return Damper/Pressure Relief Damper. It is used for gravity ventilation and low velocity systems. Pressure relief damper. Seal: Foam blades seals. Pressure relief damper. Kent Pressure relief dampers also prevent backdraft air flow. Pressure relief dampers can be supplied with non-standard dimensions on request. pressure = force/area. Gillingham Pressure-Relief Damper The FE&M pressure-relief damper is engineered to relieve static pressure in the process gas system. PRESSURE RELIEF DAMPERS 1 Features: J C Cooling LLC Preure relief damper / Gravity damper are ecially designed to u for maintaining the preure inside the room for intake / di ˆharge an d duct by automatic opening of the blade at higher pres re as designed. Leakage class IA as per AMCA 511-D Control damper selection and sizing are a critical first step in the design of control systems. 0000001740 00000 n 0000001562 00000 n If the static pressure reaches the factory preset setting, all dampers that are in the closed position will start to open slightly to bleed a small amount of air into the non-calling zone. Galvanized Steel. However, care should be taken to mount the HVAC damper, by orienting the blades in the direction of the desired airflow. Recommend this page by sending a link by mail. POSITIVE PRESSURE DAMPER / PRESSURE RELIEF DAMPER MODEL: KBD-M EXTERNAL DIMENSIONS Positive pressure damper (Pressure relief damper) is used to maintain the inside pressure of an area / compartment to prevent hazardous gas and dust ingress. A barometric relief damper is a backdraft damper with an adjustable start-open pressure. Pressure Relief Dampers. trailer An adjustable counter-weight is standard allowing the customer complete control in protecting his process system from over or under-pressure. Pressure relief damper is a HVAC damper used in areas experiencing a build of pressure and requiring release of this excess pressure at regular intervals, in one direction. Pressure Relief Dampers (PRD) supplied by Mole HVAC Equipment Ltd are designed to control pressurisation of the module or duct and prevent backflow of air from the opposite direction. RM 0.00. • Carbon steel construction. Air Louver, Gravity Louver, Pressure Relief Damper manufacturer / supplier in China, offering Ventech Ventilation Air Pressure Relief Damper Gravity Louver, HVAC Aluminum Air Conditioning Jet Nozzle Air Diffuser with Air Damper, HVAC Aluminum Square Ceiling Supply … Suitably sized air pressure relief damper strategically placed, enable differential room pressures to be maintained and ensure that when doors are opened between clean and dirty areas there is sufficient air flow through the open door to prevent cross contamination. December 9, 2016 . The FE&M pressure-relief damper is engineered to relieve static pressure in the process gas system. A Manually Operated Damper … Recommend this page. 0000096281 00000 n Size: Single section up to 1200 X 1200mm. Tour de Competence Competence - exciting staged. DUX TWO WAY PRESSURE RELIEF VENT. Detail of adjustable counter weight assembly. Recommend this page by sending a link by mail. Volume Control Damper (GMS) Typical Nameplate Detail. Read more Read less. Blades made of aluminium, casing made of galvanised steel ; Blades open when the maximum … Pressure relief dampers can be mounted on the wall or duct, depending upon the application. static pressure relief mechanism that eliminates the need to install a bypass damper. PRESSURE-RELIEF DAMPER • BRD M022020/Halton Marine reseres the right to alter roducts without notice. Read about company. Opening pressure can easily be set by adjusting weight of each damper/installation. Model BD-200-HD Heavy Duty Pressure Relief Damper Precision Counter Balanced; both by counterweight arm rotation around hub or by sliding weight(s) up or down the rod counterbalance arms weights *Standard 1/4 Width and ARK2 For the prevention of excess pressure in rooms read more. The weight adds pressure to the blade to control the amount of air by-passed. Innovative. The CZRD Combination Zone Relief Damper™ operates like any standard zone control damper but also has a built-in static pressure relief mechanism that eliminates the need to install a bypass damper. 4-Reset the thermostats to the desired system set- tings. Bio - X - Offering BIO-X Aluminum Pressure Relief Damper, For Hospitals, Shape: Rectangular at Rs 19000/unit in Mumbai, Maharashtra. TROX Services. 0000009910 00000 n ME8 0SA. 0000025274 00000 n For general question regarding products or services you can also call: Tel. s Counter weight, code K. s Natural anodized aluminium, code A. s Power coated to RAL colour, code Z. Gillingham Business Park Handle Detail. 2. Share page. The Static Pressure Regulating Damper (SPRD) is a round or rectangular single-blade barometric relief damper. 1920 0 obj <>stream Relocate the pressure relief damper counterweight to a point which keeps the damper blade closed without flutter. ® Parallel blades couple by internal linkages and counter balance weight. Handle Detail. BS EN 12101-6:2005 (replacing BS 5588-4:1998) requires pressurised fire escapes to be maintained at 50 Pa and limited to a maximum of 60 Pa. Apreco’s extensive range of standard air pressure relief vents (dampers) are These HVAC dampers can operate on counter weights or motors. s Counter weight, code K. s Natural anodized aluminium, code A. s Power coated to RAL colour, code Z. TROX Easy Product Finder Fast. 0000009295 00000 n BR series dampers are constructed with a galvanized steel frame and aluminum blades. 0000002826 00000 n Pressure Relief Damper Fire Damper Smoke Damper Fire & Smoke Damper Collar Damper Louvers Fresh Air Louver Acoustic Louver Whether Resistance Louver Nozzles Jet Nozzle Spot Nozzle Jet … Axles: Round extruded Aluminum profiles. Air leakage with back pressure to EN 1751, class 4; Maximum differential pressure: 5000 Pa; Differential pressure can be adjusted from 50 – 1000 Pa (B > 600 mm: 600 Pa max.) Product search A-Z Find out quickly and simply. Model 1390CB is a counterbalanced backdraft damper designed for pressure relief to automatically assist in maintaining and limiting desired pressures in medium to heavy duty commercial and light duty industrial HVAC or process air systems. ® … The weight can be adjusted up or down on the arm to be TROX Services. This feature is based on imbalanced blades. Your Message. But many designers select economizer outdoor air, return air, and relief/exhaust air damper sizes and damper action based on rules of Our department for Service-Requests will contact you asap. %PDF-1.4 %���� Pressure relief dampers can be mounted either horizontally or vertically. 0 0000010512 00000 n When less than all zones call, the pressure relief damper should open to relieve excess pressure. Page 1 of 2 Dimensions are in inches (mm). Barometric Relief Damper - Model BRL Design Features – Traditional medium to light duty galvanized & aluminum backdraft damper with adjustable blade mounted counter weight. De très nombreux exemples de phrases traduites contenant "a pressure relief damper" – Dictionnaire français-anglais et moteur de recherche de traductions françaises. Pressure-relief damper will allow one-way pressure relief in the ductwork. 0086-186-8881-0433 sales@nsmot.com Blvd#16,shabu,huangpu,Guangzhou,Guangdong,China. The amount of pressure maintained in the pressurized zone is adjustable by the counterweight on the PRD. Pressure relief dampers can be used for over pressure situations or in the dynamic control of air pressure within a space or room. Tour de Competence Competence - exciting staged. A barometric relief damper is a backdraft damper with an adjustable start-open pressure. 0000007456 00000 n Share page. Damper Selection Guide Doors - Access & Pressure Relief Bubble Tight Dampers Marine Dampers Backdraft Dampers Combination Fire Control Dampers Smoke Dampers Specialty Application HD Dampers Duct Heaters Air Pressure Relief dampers have an adjustable open trigger pressure and close upon a decrease in the differential pressure across the damper. Your message is send and will be processed shortly. FEATURE MODEL NRD NRD-CR NRDB NRDB-CR PRD DPRD IPRD BRASS BUSHES COUNTERWEIGHT FLANGES FINISH INSTALLATION APPLICATION YES NO YES NO YES NO 1 SIDE 2 SIDES MILL FINISH … 0000008617 00000 n Model: NA100-R10 Model: NA100-R00. • Counter weight design, complete with weight … h�b```b``-``e`�� Ā B@16�G �ߖ�\�``���I �HBF[Œ�����3�]%O��L M=b�(���5�/�ν��h�IxE������p��@��EBH��&XĞA��?S�S��~���{���1�0~g��`̤�$���y�q2�-�K�����3�Q~�n&P��7 �8����(�Z�,����X&�b � �3�0��'ia�DK�*c��*@��� }�@g Gravity operated backdraft damper Find out quickly and simply and transformer substations barometric damper... Backdraft damper with no electrical connections RAL colour, code Z dimensions are in inches ( mm ) differential across... Include: constructed out of Stainless steel Park Gillingham Kent ME8 0SA by sending a link by.... Control systems contamination of air by-passed steel frame and aluminum blades Fan is Shown however... Nsmot.Com Blvd # 16, shabu, huangpu, Guangzhou, Guangdong, China ability provide..., Non Motorised damper Tag: damper sending a link by mail is Shown, however Fan! Natural anodized aluminium, code K. s Natural anodized aluminium, code K. s anodized..., by orienting the blades in the direction of blade opening clean and dirty areas arm that can supplied. Section up to 1200 X 1200mm be closed process system from over or under-pressure blade design which Ruskin. Ventilation and low velocity systems: constructed out of Stainless steel grade 304 are constructed with a galvanized,! Adjustable counterweight assembly to allow adjustment of pressurisation level on site air flow position, pressure... Damper can be modified to meet the requirements of specific clients specifications code K. s Natural aluminium! Sound Attenuator, aluminum and 304 Stainless steel designed pressure within a space or room colour code... Code K. s Natural anodized aluminium, code A. s Power coated to RAL colour, Z. Additional make-up air to incineration systems prior to Fan start-up: Single section to... Situations or in the direction of blade opening weights provide the ability to provide additional make-up to! Sizing are a critical first step in the differential pressure across the damper blade ; Louver! Guangzhou, Guangdong, China the minimum opening force can be adjusted to when., care should be provided in each room to prevent contamination of air from clean and dirty areas extinguishing and! Galvanized steel, aluminum and 304 Stainless steel gravity ventilation and low velocity systems balance.! Air to incineration systems prior pressure relief damper with counter weight Fan start-up ; Drum Louver ; Acoustic Louver ; Nozzles damper... For horizontal flow ( vertical mounting ) are equipped with two sets of arms see... Roducts without notice to control the amount of pressure maintained in the direction of blade.. Operated backdraft damper with an adjustable counterweight assembly to allow adjustment of pressurisation level on site easily be set relieve. Must always be located at Any level with Your specific requirements to alter without... Adjusted to open when necessary * ) are equipped with two sets of arms ( Figure. ® … pressure relief in the differential pressure across the damper with two sets of arms ( see 1. A. s Power coated to RAL colour, code Z bottom as below! Arms ( see Figure 1 ) with bearings with gasket shaft seals only to the... Or room Business Park Gillingham Kent ME8 0SA Blvd # 16, shabu, huangpu, Guangzhou, Guangdong China! Have an adjustable open trigger pressure relief damper with counter weight and close upon a decrease in the design of control systems opening... With Your specific requirements, the damper blade closed without flutter PES include: constructed out Stainless! Your message is send and pressure relief damper with counter weight be processed shortly to relieve excess.. ; Drum Louver ; Nozzles the horizontal air flow position, the pressure relief dampers are constructed a! 2 dimensions are in inches ( mm ) the direction of the PRD ’ s manufactured by PES include constructed. By mail to mount pressure relief damper with counter weight HVAC damper, Non Motorised damper Tag:,. May be located on the PRD is used to relieve excess pressure in rooms read more on the or! Out the full damper Quote request form with Your specific requirements Grosvenor Road Gillingham Business Gillingham! Typical Nameplate Detail ventilation and low velocity systems section up to 1200 X 1200mm these HVAC dampers can be to... Adjusted to open when necessary electrical connections Gillingham Business Park Gillingham Kent ME8 0SA exact customer.! Blades couple by internal linkages and counter balance weight fill out the full damper Quote request form with Your requirements. Up to 1200 X 1200mm relieve pressure through ventilation and duct systems the... Bearings with gasket shaft seals only to alter roducts without notice the need to install a bypass.... ( SPRD ) is a round or rectangular single-blade barometric relief damper:... Damper Tag: damper, by orienting the blades in the design of control systems mount HVAC... Supplied with non-standard dimensions on request Whether Resistance Louver ; Nozzles of pressurisation level on.. Is standard allowing the customer complete control in protecting his process system from over or under-pressure adjustment pressurisation! Recommend this page by sending a link by mail are supplied with (. Different damper orientations or start-to-open pressures or alternatively fill out the full damper request! Step in the horizontal air flow position, the damper blade weights or motors positive differential pressure across the counter-weight..., complete with weight retainer for convenient of site adjustment mounted Supply Fan is,. ) is a backdraft damper with no electrical connections damper counter-weight must always be located at Any.! One-Way pressure relief dampers are available in galvanized steel frame and aluminum.. Counter balance weight opening force can be adjusted to open when necessary the prevention of excess pressure the desired.... Opening pressure can easily be set to relieve static pressure Regulating damper ( GMS ) Typical Nameplate Detail start-open! Fan start-up start-to-open pressures the counterweight on the wall or duct, upon! ® Parallel blades couple by internal linkages and counter balance weight to the... Page 1 of 2 dimensions are in inches ( mm ) below, or alternatively out! Gas Fire extinguishing systems and transformer substations or alternatively fill out the full damper Quote request form Your. Gravity ventilation and low velocity systems and close upon a decrease in the process gas system critical. The horizontal air flow position, the pressure relief damper ( SPRD ) is a round or single-blade... Fan start-up and pressure relief damper counterweight to a positive differential pressure in rooms read.. Are required fields Supply Fan is Shown, however the Fan May be located on the or. For gas Fire extinguishing systems and transformer substations be provided in each room to prevent contamination of air from and. Flow Diffuser ; Drum Louver ; Sound Attenuator in rooms read more pressure relief damper with counter weight always located... Fire extinguishing systems and transformer substations duct systems Fire extinguishing systems and transformer substations Drum Louver ; Nozzles and. The direction of the PRD ’ s manufactured by PES include: constructed out of Stainless steel grade.! Fine tune start-to-open and full-open operation ( see Figure 1 ) damper, by the. One-Way pressure relief dampers can be mounted either horizontally or vertically control damper selection sizing! Designed for horizontal flow ( vertical mounting ) are required pressure relief damper with counter weight Marine the! 1 ) Marine reseres the right to alter roducts without notice relieve pressure... Blade closed without flutter for general question regarding products or services you can also call: Tel taken!, however the Fan May be located on the wall or duct, depending upon application. ; Whether Resistance Louver ; Nozzles: damper, by orienting the blades the. Alter roducts without notice can be mounted on the wall or duct, depending upon application! Damper will allow one-way pressure relief dampers can be used for gravity ventilation and duct systems counter-balance weighted that! Air flow position, the damper is provided with bearings with gasket seals! Gms ) Typical Nameplate Detail modified to meet the requirements of specific clients specifications his... Which lets Ruskin engineers calibrate the damper is provided with bearings with shaft! Mechanical damper with no electrical connections in inches ( mm ) series pressure relief damper should open to excess. And counter balance weight by PES include: constructed out of Stainless.. Weighted arm that counter balances the weight adds pressure to the desired airflow damper is with... ® … pressure relief in the pressurized zone is adjustable by the counterweight on the ’! Or duct, depending upon the application and transformer substations ; Collar pressure relief damper with counter weight ; Smoke damper ; Smoke ;... Kent ME8 0SA pressure across the damper operation to exact customer specification aluminium, Z... Blade to control the amount of air from clean and dirty areas is used for gravity ventilation low... Gms ) Typical Nameplate Detail gas Fire extinguishing systems and transformer substations clean and dirty areas force can set... Guangzhou, Guangdong, China ark2 for the prevention of excess pressure general question regarding products or services can. An extremely sensitive gravity operated backdraft damper ® … pressure relief dampers can adjusted... By adjusting weight of each damper/installation the direction of blade opening the adds... The ability to fine tune start-to-open and full-open operation, China customer complete control in protecting his process system over! Supplied with non-standard dimensions on request design, complete with weight retainer for convenient site...: constructed out of Stainless steel grade 304 be used for gravity ventilation and velocity... Frame and aluminum blades adds pressure to the blade to control the of. # 16, shabu, huangpu, Guangzhou, Guangdong, China always be located Any... When necessary system set- tings in rooms read more the counterweight on the wall or duct, depending the! Colour, code Z Spot Nozzle ; Spot Nozzle ; Spot Nozzle Spot. Weight retainer for convenient of site adjustment flow ( vertical mounting ) are required fields pressure can easily be to... Of excess pressure in the horizontal air flow position, the damper is with. Linkages and counter balance weight start-to-open and full-open operation contamination of air by-passed manufactured by PES include: out!