So what's better - inline duct fans or the kind that sit on top of the register? The ducts for my mstr. bdrm. run though the crawl space, up the garage wall, across the garage ceiling and into my room. The garage is drywalled and insulated but by the time the air gets there it's cooled down some. I need something to force the air up there quicker, but will the fans throw the circulation off for the rest of the house?
2006-10-13 01:34:45 · 4 answers · asked by Jim C 5 in Home & Garden ➔ Maintenance & Repairs
If your talking about heated air moving it faster will just add to your cooling it off. You need to get the cooler air out of the room via the return air vents. The heat will travel to your room in it's absence. AC cycle run at a faster blower speed but you still need to get hot air out of room via return air to create a natural convection of air flow to assist with comfort.
2006-10-13 01:44:26 · answer #1 · answered by Ibeeware 3 · 0⤊ 0⤋
the expensive centrifugal fans are the best, as another man said. yes they will rob air flow from the rest of the house.
befor you spend alot of money look around and see if theres any "flex" that has been crushed.
look at the takeoff for the branch going to the bedroon and make sure theres not a damper in it thats closed down.
a 6" duct will only flow 120 cfm befor it starts to whistle and an 8" will flow 240 cfm. (thats at .1" static pressure)
if you up the static pressures you up the air velocities and you will have a nice whistle or a roar
hope this helps you out,
Possum
2006-10-14 00:00:29 · answer #2 · answered by hillbilly named Possum 5 · 0⤊ 0⤋
you are in luck this is something I have done many times here in texas. Use in line centrifugal duct fans onle not the cheap propeller in line fan. wire it into the furnace so it runs when the fan in the furnace is running. you can get fancy and use low voltage controls and even speed controllers. I sometimes use a duct pressure switch to turn on the fan once it senses the main fan is on. These fans are not cheap at 300 to 500 each.
I recently put one in a house that had downstairs problems for 20 years and the ducts could not be replaced with a larger size due to wallcovering. The fan we chose put out 1/2 inch static pressure and 900 cfms. this was three times the amout they were getting. customer is no sheetrock had to be removed. suppliers like WW graingers or Johnstone supply carry them.
2006-10-13 15:17:55 · answer #3 · answered by The Must know man 2 · 0⤊ 0⤋
You need to insulate the ductwork.
2006-10-13 05:25:48 · answer #4 · answered by Carp 5 · 0⤊ 0⤋