Smarty wrote:
trader_4 wrote:
On Tuesday, February 17, 2015 at 8:30:13 AM UTC-5, Art Todesco wrote:
On 2/17/2015 7:24 AM, trader_4 wrote:
On Monday, February 16, 2015 at 11:44:06 PM UTC-5, HVAC Man wrote:
replying to intersoft4you, HVAC Man wrote:
intersoft4you wrote:

Hi everybody,
I have just installed new High Efficiency furnace (Keeprite). In the
manual 2 pipes are depicted (Exhaust and intake) running outside of the
house. However, the installer has left the intake pipe inside of the
basement (the pipe is about 20 inches long above the furnace). He says
it's OK to have an intake pipe to suck the air from within the
basement. Is it?
Thanks a lot!
Viktor



A high efficiency furnace should draw air from the same pressure zone !
Meaning the inlet air pipe and the exhaust air pipe should be in close
proximity to one another allowing equal pressure changes. Both pipes
should always be installed on the same side of the house as well. Whomever
said you are allowed to to draw intake air from the basement is just
looking to make some easy money on nuisance pressure sensor trips....


Nonsense. Many furnaces can be installed using either outside
combustion air or inside. It's permitted per the manufacturer's
installation instructions. In most cases it makes more sense to
use outside air, especially if the furnace is located in a heated
space, because if inside air is used, the makeup cold air will be
drawn in to the structure from outside through leakage.

Yep. Not only that, but some of the earlier high efficiency furnaces
didn't even have an air intake pipe. I had an Amana, probably from the
90s, that had a standard open burner arrangement just like the furnaces
from the 70s. I just drew air from the room where it was installed. The
exhaust on the Amana, was the standard PVC out the side wall of the house.

Not that it matters at this point, as this is a revival of an old post,
but the install manual for the furnace would have the answer as to how
it can be installed. My Rheem, it could installed either with outside
air or using air from within.

Same thing here. My two Heil furnaces never required outside air, the first
running for 22 years, The current one running for 10 years. No nuisance
trips or other issues.

Hi,
Ever done an energy audit to see how air tight your house is?