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Tamarack R.A.P.
Return Air Pathways
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R.A.P.'s (Return Air Pathway) are passive pressure balancing systems for use with ventilation or
forced air heating or cooling systems where it is often impossible to provide both supply and
return ducts to every room.
Closing the bedroom door can cause mold growth!
When a building is conditioned by a forced air system, the air flows from and back to the air handler.
By design, the flow should be balanced as it moved through the system. It is common practice to put a
supply outlet in each room and use centralized returns, assuming that the rooms themselves will serve
as the return ducts. In this situation, room doors can become dampers, blocking the return flow.
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Features:
- Easy Installation
- Increase Energy Efficiency
- Reduce Transfer of Sound & Light
- Reduce Structural Damage
- Five Year Warranty
- Made in the USA
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Pressure imbalances are developed in the building when air from the supply register of a forced air
system is obstructed from reaching the return register. The pressure differences seek to balance
themselves by leaking through available cracks and holes. The out-of-balance condition will reduce
the efficiency of the system, reduce the comfort in the space, and worse, cause moisture to condense
in the wall system, enhancing the growth of mold and mildew and will eventually cause breakdown of
building materials.
Ideally, there should be a return in every room, bypassing the role of the rooms as return ducts.
If that is not possible, undercutting the doors provides some relief, but this is usually insufficient.
Adding R.A.P.'s will reduce cold and hot spots, allow the system to work more efficiently, and balance
the pressure in the building to reduce the chance of inadvertent leakage.
The R.A.P. systems provide the superior balancing characteristics of a simple through-the-wall penetration,
while reducing the problems of light and noise transmission. The baffle in the R.A.P. smoothes the flow
of air, straightening the turbulent paths. But because light and sound travel best in a straight line,
only the most direct light and sound sources move easily through the pathways and privacy is greatly
enhanced.
Location
The system will be effective regardless of position, providing it is placed in a wall that separates an
air supply and return duct. Placement must be given consideration to benefit from noise and light
reduction properties. A variety of sizes are offered to allow R.A.P.'s to be installed above the door
or installed in inside walls.
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Model
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Opening
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with Flange
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Grill
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RAP 8.8
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8" x 8"
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10" square
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9.75" square
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RAP 10.6
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10" x 6"
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12" x 8"
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11.75" x 7.75"
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RAP 12.4
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12" x 4"
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14" x 6"
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13.75" x 5.75"
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RAP 12.6
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12" x 6"
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14" x 8"
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13.75" x 7.75"
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RAP 12.12
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12" x 12"
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14" square
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13.75" square
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RAP 14.8
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14" x 8"
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16" x 10"
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15.75" x 9.75"
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What size R.A.P. is best for your application?
- Determine the amount of air being delivered to the room through the HVAC supply vent.
- Select the combination R.A.P. and door gap that will match the flow of air delivered.
Example: 177 cfm is being delivered. There is a 1" gap under a 30" wide door (50 cfm).
The R.A.P. you would need would be 12.12 (127 cfm). 50 + 127 cfm = 177 cfm.
Basic Specifications:
- All models include a sheet rock flange.
- The depth between the flanges is 3.5".
- The overall depth is 4.625"
- Each unit comes with a pair of white grilles
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Tamarack R.A.P. Product Brochure
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