# Thread: Done a little diggin'

1. ## Done a little diggin'

Inspected High Eff Furnace today, with no outside intake...only ABS exhaust pipe. First, is it code to have intake sucking from basement? Second, isn't ABS supposed to be changed out to PVC..Oh yeah the basement is finished...IMGP3630.jpgOpinions?

thnx jb

2. ## Re: Done a little diggin'

You have not described much detail.
Can you further explain, where is the appliance located and fuel.
It may fall under your local combustion and dilution air requirements.

3. ## Re: Done a little diggin'

Originally Posted by ROBERT YOUNG
You have not described much detail.
Can you further explain, where is the appliance located and fuel.
It may fall under your local combustion and dilution air requirements.
Hi Robert, it is a gas fired High Efficiency furnace Armstrong Air Ultra V Tech 91 Model #G1D91AUG050D12B-2A Serial- 8403A11663. It is located in the furnace/utility room. It has an ABS exhaust pipe with no fresh air supply to the unit. It draws directly from basement. 50k input, with 45.5k output....

4. ## Re: Done a little diggin'

The formula I use to use for combustion air in a inclosed room with door vents:Take the cubic footage of the enclosed room. (HxWxD).
Multiply by 20.

OR
House of Craig - Online Combustion Air Calculator

Although some may agree while others not, are we suppose to be doing these type of calculations when a home inspection is considered visual only?

As for your ABS.PVC question, see what the manufacturer recommends. That trumps all.

5. ## Re: Done a little diggin'

Originally Posted by ROBERT YOUNG
The formula I use to use for combustion air in a inclosed room with door vents:Take the cubic footage of the enclosed room. (HxWxD).
Multiply by 20.

OR
House of Craig - Online Combustion Air Calculator

Although some may agree while others not, are we suppose to be doing these type of calculations when a home inspection is considered visual only?

As for your ABS.PVC question, see what the manufacturer recommends. That trumps all.

Thanks Robert, will do!

6. ## Re: Done a little diggin'

If this is a recent installation ABS is no longer permitted as per TSSA. Schedule PVC 40 is now required in new installations.

As to intake air its not a problem with the combustion air being drawn from the basement. An intake line can be run to outdoors with little problem.

7. ## Re: Done a little diggin'

Originally Posted by Raymond Wand
If this is a recent installation ABS is no longer permitted as per TSSA. Schedule PVC 40 is now required in new installations.

As to intake air its not a problem with the combustion air being drawn from the basement. An intake line can be run to outdoors with little problem.

Thanks Ray, Kind of knew that, just looking for confirmation though, and you did that, thank you! Now on with the Ontario licensing....I'm thinking this will help or may hurt my business, wishing you luck sir! jb

8. ## Re: Done a little diggin'

Hi John

Don't disappear. I like what you have to say. Come over and join the conversation about CSA if you get time and it interests you.

Best,

9. ## Re: Done a little diggin'

Originally Posted by Raymond Wand
Hi John

Don't disappear. I like what you have to say. Come over and join the conversation about CSA if you get time and it interests you.

Best,
Ray,
ABS 40 or 80.

John, I thought it was a recent install?

Like in bridge recommend playing the trump card, Manufacturers recommendations.

https://www.professionalplastics.com...SPipeSizes.pdf

11. ## Re: Done a little diggin'

Correction. Its not schedule 40 PVC the new approved material is shown in the photo.

12. ## Re: Done a little diggin'

ABS was allowed when that furnace was installed. PS, it may still be used for the intake.

The air intake pipe is optional, unfortunately, unless the furnace is in a small airtight room. So I will generally recommend installing a fresh air intake for better heating efficiency. And maybe mention that ABS is now considered unsuitable for exhaust.

13. ## Re: Done a little diggin'

Originally Posted by Raymond Wand
Thanks. I posted the wrong link. Ops.