Adding a duct fan inside the ductwork of each room you have completed remodeling
maintains it under a slight positive pressure.
It's also beneficial in rooms where folks with allergies sleep!
Maintaining a room with a slightly positive pressure keeps contaminants from
entering through cracks around window seals and from under the door.
I bought a very old post-war house that has more gaps and cracks than a sieve
has holes. As I finish renovating each room, I wanted to keep the dust,
especially construction dust from entering the completed rooms. Maintaining
them under positive pressure will do just that.
Trouble was, the decal on the fan that showed the airflow direction was on
backwards, pointing the wrong way. So it got installed backwards. Therefore
it was drawing more dust into the room by creating a negative pressure in
Finally figured this out when I saw more dust on the top of the register
filter than on the bottom side of it.
When all the construction is done, you can remove the duct fans, or connect
them to individual room thermostats if you have zoned HVAC.
On Fri 27 May 2005 07:31:39a, Gary V. Deutschmann, Sr. wrote in
Thanks, Gary. A brilliant idea to a dusty problem. I have only used a
duct fan once. That was for a duct leading to an isolated 2nd floor room
that didn't get adequate air supply. It had a built-in sail switch that
turned it on and off with the force of air coming from the furnace.
Luckily it's air flow label was correct. :-)
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.