# Furnace insatllation **URL:** \ **Category:** Inspecting HVAC Systems\ **Created:** [April 28, 2012, 7:27pm UTC](https://forum.nachi.org/t/furnace-insatllation/68773 "2012-04-28T19:27:37Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![chagler](https://avatars.discourse-cdn.com/v4/letter/c/5e9695/32.png) [@chagler](https://forum.nachi.org/u/chagler)\ **Post date:** [April 28, 2012, 7:27pm UTC](https://forum.nachi.org/t/furnace-insatllation/68773/1 "2012-04-28T19:27:37Z")
Anyone know of a problem with this installation. It is a universal install but they cut the side out for the return air. ![furnace1.jpg](https://global.discourse-cdn.com/internachi/original/3X/8/c/8c2105868d0f647a3f8fd5fdfa57fedb3e42af9f.jpeg) ![furnace.jpg](https://global.discourse-cdn.com/internachi/original/3X/9/5/9505b6a6f3da326a3efdad4b4ff20224a7b49ddc.jpeg) ---
**Author:** ![chagler](https://avatars.discourse-cdn.com/v4/letter/c/5e9695/32.png) [@chagler](https://forum.nachi.org/u/chagler)\ **Post date:** [April 28, 2012, 7:29pm UTC](https://forum.nachi.org/t/furnace-insatllation/68773/2 "2012-04-28T19:29:04Z")
This might help better illustrate ![furnace.jpg](https://global.discourse-cdn.com/internachi/original/3X/b/e/bed645fcb5b674e7bdbd1fe468067982afd45558.jpeg) ---
**Author:** ![lkage](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/lkage/32/347658_2.png) [@lkage](https://forum.nachi.org/u/lkage)\ **Post date:** [April 28, 2012, 11:50pm UTC](https://forum.nachi.org/t/furnace-insatllation/68773/3 "2012-04-28T23:50:40Z")
Squirrel cage looks clean. Where is the filter? ---
**Author:** ![cbottger](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cbottger/32/206_2.png) [@cbottger](https://forum.nachi.org/u/cbottger)\ **Post date:** [April 29, 2012, 2:27am UTC](https://forum.nachi.org/t/furnace-insatllation/68773/4 "2012-04-29T02:27:11Z")
Does the front cover have a return hole cut in or are my eyes failing??? ---
**Author:** ![chagler](https://avatars.discourse-cdn.com/v4/letter/c/5e9695/32.png) [@chagler](https://forum.nachi.org/u/chagler)\ **Post date:** [April 30, 2012, 2:54am UTC](https://forum.nachi.org/t/furnace-insatllation/68773/5 "2012-04-30T02:54:59Z")
The filter is where I took the picture of the fan. It’s in the living room adjacent to the furnace. It’s a short chase with a filter grill in the wall of the living room. You can see how they just cut the metal out of the side of the unit. No there’s no hole in the front. Are you talking about the black knob at the top of the unit? ---
**Author:** ![dhalligan](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dhalligan/32/59602_2.png) [@dhalligan](https://forum.nachi.org/u/dhalligan)\ **Post date:** [April 30, 2012, 3:08am UTC](https://forum.nachi.org/t/furnace-insatllation/68773/6 "2012-04-30T03:08:31Z")
Furnaces are designed to draw return air from either side or through the bottom. The duct configuration will determine which side is cut out for the return air duct connecion. ---
**Author:** ![cbottger](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cbottger/32/206_2.png) [@cbottger](https://forum.nachi.org/u/cbottger)\ **Post date:** [April 30, 2012, 3:10am UTC](https://forum.nachi.org/t/furnace-insatllation/68773/7 "2012-04-30T03:10:50Z")
I was talking about where you had the yellow arrow pointing. If there is a filter grill opening into another room that would be correct but there can be no return air drawn from within that closet or area of the furnace and water heater ---
**Author:** ![dandersen](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dandersen/32/59398_2.png) [@dandersen](https://forum.nachi.org/u/dandersen)\ **Post date:** [April 30, 2012, 5:10pm UTC](https://forum.nachi.org/t/furnace-insatllation/68773/8 "2012-04-30T17:10:49Z")
1. It will be very noisy. 2. The fan draws from both sides of the fan. This one is open to just one side. There will be a reduction in flow, but as there isn’t any return duct friction loss it will not likely be noticeable. ---
**Author:** ![cnorlen](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cnorlen/32/702_2.png) [@cnorlen](https://forum.nachi.org/u/cnorlen)\ **Post date:** [April 30, 2012, 7:11pm UTC](https://forum.nachi.org/t/furnace-insatllation/68773/9 "2012-04-30T19:11:57Z")
> [@chagler](#): > > Anyone know of a problem with this installation. It is a universal install but they cut the side out for the return air. Common option for installation. [Lennox G17 Installation Manual](http://www.lennox.com/pdfs/installation_maintenance/Lennox_G17_IOM.pdf), page 5, right column “B-Return Air Opening”