What is the purpose of a fresh air damper?
The Fresh Air Damper (FAD) is a 24VAC power-open, power-close motorized air damper designed for installation in a fresh air ventilation duct connected to an outdoor air intake hood and a duct fan or the HVAC return plenum, to control the flow of fresh air into the home.
How do you close a fresh air intake damper?
Closing the Supply of Air from Outside By blocking it, you could strain the system or, in the case of an intake serving a furnace, cause negative pressure that causes fumes and carbon monoxide to back up. That being said, you can safely close an intake vent by sliding the dampers into the closed position.
How do I add fresh air to my HVAC system?
Adding a fresh air inlet to most systems is typically a simple and relatively inexpensive proposition. Outside air enters the system through a roof or sidewall vent inlet that collects air from a clean outside location. The air is pulled into the system through a filter, and then a duct connected to the return plenum.
Is a fresh air intake necessary?
Fresh air intakes are necessary for any home that has a furnace. Whether you have a conventional furnace or a high-efficiency option installed, there are downsides to not having a functional, fresh air intake.
When should a fresh air damper open?
(2) In manual damper control systems, someone should open the damper when the building is occupied (to some pre-arranged set point) and then close the damper when the building is unoccupied and the OA dew point temperature exceeds 55F.
How often should fresh air intake run?
Fifteen to 20 minutes is preferable. However, when you open them is also important. Keep them open at night or in the early morning, when the weather is cooler. Then, before things start to heat up, close the windows and draw the blinds to keep that cool, fresh air inside as long as possible.
How does a damper end switch work?
End switches are typically wired to a fan and/or to a light serving as an open/not open indicator. When the damper is powered open, one of the damper blades makes contact with the spring rod of the end switch which in turn makes a connection allowing power to flow to the fan and/or light.
How much does it cost to install fresh air intake?
A low-end price would be $120 to replace roof exhaust fans. On the high end, $10,000 for a brand new installed hybrid system. The national average range of costs is $300 to $6,000….Ventilation System Price.
| Cost to Install Ventilation | |
|---|---|
| Average range | $300-$6,000 |
| Minimum cost | $120 |
| Maximum cost | $10,000 |
Does my furnace bring in fresh air?
Since high efficiency furnaces draw air directly from outside, the furnace itself does not require a fresh air intake in order to replace inside air that otherwise would have been drawn from the room the furnace is located in. No matter what kind of furnace you have installed, the system will push air out of your home.