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• ALL KEY PARTS ARE DETACHABLE AND EASILY REPLACED WITH SPARE PARTS.
• DAMPER SHALL BE FULLY OPERATIONAL AT TEMPERATURES UP TO 200º F.
• DAMPER HAS A LEAKAGE RATING OF ZERO CFM @ 30” W.C.
• ALL METAL PARTS IN CONTACT WITH PROCESS AIR STREAM ARE 316 SST. MORE EXOTIC METALS SUCH AS HASTELLOY AND TITANIUM ARE OPTIONAL.

Suggested  Specifications for Round FRP Air Control Dampers
Dampers are installed as shown on plans and per specifications. Damper frame shall be of one-piece construction with a resin rich interior corrosion barrier having a minimum thickness of 100 mils. A structural wall shall consist of alternate layers of chopped strand mat and woven roving to conform to ASME/ANSI RTP-1 and NBS PS 15-69. The overall glass and resin content shall be 40% and 60% by weight, respectively.The fiberglass flange dimensions shall be per NBS PS 15-69 Table 2 for dimensions and bolthole drilling pattern.

The flanges shall have a minimum thickness of 3/4 inch and shall be constructed integral to the cylindrical body of the damper, using the hand lay-up technique per ASME RTP-1-2000 standard Fig 4-7. The distance between the faces of the flanges shall be 6 inches for dampers having a diameter size of 8 inches or less. For all other damper sizes, this distance shall be 12 inches long. The damper blade and stiffeners shall be fabricated using the same resin as the damper frame. The damper blade shall be of unitary construction having no detachable parts or circumferential or wiper blade seals. Damper blade shall be designed to prevent over-rotation without the use of backstops located anywhere in the air stream. 316 SST blade shaft shall be continuous, centered, and custom-milled to fit the operator. Both the damper blade and shaft shall be fully detachable from each other and readily disassembled from the damper body for easy repair or maintenance.

Damper shall have an FRP structural stand-off bracket integrally laminated to the exterior of the body for mounting a worm gear operator.

Damper shall be provided with a self-lubricated hand-wheel driven worm gear operator, as manufactured by:

• Dynatorque, or equal

Operator shall be sized according to required operating torque. Operator shall be coated with corrosion resistant epoxy. All metal parts exposed to the air stream shall be 316 SST. All zero-leakage dampers located at elevations exceeding 6’-6” above finished floor shall, in addition to the hand wheel, be equipped with chain wheel sprockets and appropriately sized chain lengths, as manufactured by:

• Babbitt, or equal

Chain wheel sprockets shall have integral chain guides to prevent “gagging”.

Annular DanELAST corrosion resistant elastomer sealing seat shall be embedded in the damper body to achieve zero leakage.

Exterior surface of damper shall contain UV inhibitor, and be gel coated or painted with color to match existing ducting.

FRP dampers shall be tested for pressure drop and leakage in accordance with AMCA Standard 500-D. AMCA 500-D leakage tests shall be performed by AMCA certified testing facilities. The leakage rate shall be a maximum of 0 C.F.M per square-foot of cross-sectional area at 30-inches w.g. pressure. The test results shall be submitted for review and approval by the Engineer. The zero-leakage damper shall bear the AMCA seal.

Approved manufacturer of zero-leakage isolation damper shall be:

• Daniel Mechanical – Model: DanELAST 303
• Or equal

Daniel Mechanical Company certifies that the Model 303 dampers shown herein are licensed to bear the AMCA Seal. The ratings shown are based on tests and procedures performed in accordance with AMCA Publication 511 and comply with the requirements of the AMCA Certified Ratings Program. The AMCA Certified Ratings Seal applies to air performance and air leakage ratings.
Test method is per AMCA Standard 500-D-98 Figures 5.3, 5.4 Alternate-6.3, 5.5, & 5.6, 6.5. Data are based on a seating torque of chart listed in-lbsapplied to hold the damper in the closed position. Air leakage is based on operation between 50°F – 104°F.

Simpler and Easier to Replace

The elastomer portion of the DanFLEX flexible connector is an off-the-shelf commodity item. All parts of DanFLEX are pre-engineered, made to standard sizes, and are interchangeable. As a result, replacement lead time is reduced. Furthermore, in the event that the mating equipment is modified and requires a different bolt-hole pattern, the flange can easily be replaced without having to change out the entire flexible connector.

Withstands Extreme Torsional Forces

DanFLEX flexible connector is designed to absorb extreme and sudden torsional forces without wrinkling and (eventually) cracking of the molded elastomer volute. As an intended fail-safe feature, if excessive twisting forces are applied to the fl ex connector, the flanges will slip inside the tubular elastomer sleeve instead of tearing it.

Facilitates Accurate Installation

DanFLEX has an adjustable overall length, facilitating a more accurate fi t and finish when installing in parent duct/pipe spools which have finite length measurements. This is easily achieved by extending the length of either of the FRP flanged stubs located at each end of the flexible connector.

Longer Warranty Period

Daniel Company’s DanFLEX flexible connector comes with double the warranty period offered by other manufacturers.

Suggested Specifications for Round Flexible Connectors

Flexible connectors shall be provided wherever indicated. To maintain overall system responsibility by a singular source, all flexible connections shall be supplied by the MANUFACTURER of the FRP duct/ pipe. Acceptable flexible connector is DanFLEX Model 101 as manufactured by Daniel Company, or equal.

Flexible connectors are intended to be used in rigid duct/pipe systems for lateral, torsional, angular and axial movement due to expansion, contraction, and vibration. Product may be utilized to compensate for minimal misalignment. Construction shall be of multiple layers (2 minimum) of vulcanized polyester tire-cord fabric reinforcement, sandwiched between 60 to 70 durometer elastomer inner liner and exterior cover. Use of reprocessed/ reclaimed rubber is not acceptable. Tire-cord fabric will be layered at an optimal bias angle with Resorcinol Formaldehyde Latex for superior rubber-to-fabric bonding.

Seamless construction, built as one continuous piece with integral molded hollow arched volutes, shall permit up to a total of 4” of axial contraction and expansion.

Flexible connectors shall be designed to allow for a minimum of 1” of offset movement in any direction. No wrap, seamed or spliced type flexible connectors will be allowed.

Flanges shall be of FRP construction per NBS PS 15-69- 3.4.7. Bolt-hole pattern shall fi t that of mating duct/pipe or equipment.

316 SST retainer bands shall be used with adjustable screw seal type fasteners. All hardware and materials of construction shall be suitable for H2S laden corrosive environment and able to resist UV rays.

Approved manufacturer of flexible connectors shall be:

• Daniel Company – DanFLEX Model 101