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Quest DRY 70 Installation, Operation and Maintenance Instructions
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4.4A Supply Air
CAUTION
DO NOT draw air directly from the kitchen, laundry, or isolated basement.
You may draw air from a basement that is open to the workspace. All exible ducting connected to the
Quest Dry 70 should be UL listed.
A short piece of exible ducting on all Quest Dry 70 duct connections is recommended to reduce noise and
vibration transmitted to rigid ductwork in the structure. Ducting the Quest Dry 70 as mentioned requires
consideration of the following points:
Duct Sizing: For total duct lengths up to 25', use a minimum 8" diameter round or equivalent rectangular.
For longer lengths, use a minimum 10" diameter or equivalent. Grills or diffusers on the duct ends must not
excessively restrict airow.
Connecting to existing HVAC systems: An optional 8" check backdraft damper is available from the factory
to prevent reverse air ow through the Quest Dry 70. If the Quest Dry 70 is ducted to the supply of an air
handler, the check damper should be placed in the Quest Dry 70 supply duct.
CAUTION
Contact the factory when connecting to a static pressure of greater than or equal to +.5" WG.
4.4B Ducting for Fresh Air — Option
Fresh air may be brought into the structure by connecting an insulated duct from outside the structure to the
6" inlet of the Quest Dry 70. Advantages of this form of ventilation include:
1. Outside air is ltered before entering the building.
2. Outside air will be dehumidied before entering the building if the Quest Dry 70 is running in
dehumidication mode.
3. Drawing air from outside and blowing inside aids in slightly pressurizing the structure. This helps
prevent dirty and humid air from entering elsewhere. It also reduces the potential for carcinogenic
radon gas to enter and provides a small amount of make-up air for open combustion and exhaust
devices like the clothes drier, replace, and water heater.
4. Exhaust fans are recommended in the bath rooms and kitchen.
In cold climates or areas where the outdoor dew point is low at times, ventilation can be used to dehumidify
the structure, making the Quest Dry 70 capable of year-round drying. This is accomplished by bringing
the dry, low dew point air into the structure during these times. This approach is often more economical
than running the dehumidier to remove excess moisture from the structure. In cold climates, adequately
ventilating is critical to reduce the inside moisture content and avoid moisture accumulating in the wall
cavities. TIP: If your house experiences condensation on the interior surface of the windows during the
winter, increasing the amount of ventilation will often solve the problem.
An insulated 6" diameter duct is generally sufcient to provide up to 70 CFM of outside air. Large quantities
of outside air will impact Quest Dry 70 performance positively or negatively, depending upon the inside and
outside air conditions. The outside air duct should be connected to the front of the unit. With a standard tee,
the amount of outside air can be restricted with a blade damper.
FOR HVAC INSTALLER ONLY
