Help! Potential Venting Issue Rheem 90

[canadianim]

Contractors onsite now. Rheem Prestige 90 unit is being installed within 5 feet of outside wall but outside 2nd story deck is about 7feet high. Contractors concerned about proper outside vending. May have to cut hole in deck & put in an elbow and vent it through the deck. I'm ok with this, but I am concerned if there are issues with 'how many elbows' or 'angle of elbows' or length of outside vent. Any advice would be GREATLY appreciated.
LIVE 11:17am EST Toronto Canada

[House]

Can you post a couple of pics?

[beenthere]

How close will the vent be to the deck.
The deck can be treated the same as a sofit for clearence.

[canadianim]

sorry took so long, had to convert photo into a Word document to get the file size down from 2meg to less than 100K !

This is a picture of the wall where they need to vent the furnace. The furnace is sitting about 3-5 feet behind the brick wall where you see the A/C unit.

Thanks!

[beenthere]

I can't view it.

[canadianim]

I will try to convert it again to another format. Damn camera takes too high quality photos!

[canadianim]

hopefully you can see this picture and help us. thx !

[BuzzLitYr]

See if this works... it was VERY small....

[House]

That tall vertical white pipe is a downspout, correct?

[canadianim]

to HOUSE: Yes, that is the downspout you see.

[canadianim]

Thanks Buzz!

[Mr Bill]

[canadianim]

BEENTHERE - Mr.Bill has posted a nice large picture for you. THANKS MrBill!

[beenthere]

Are there any doors or windows above the deck where the vent will be. If not.

With the clearence to the deck and being at an inside corner. Going through the deck is probably your best bet.
The install manual will have the number of ells you can use for the length of vent pipe.
Being that close to the wall, I doubt you'll be close to the limit.

[beenthere]

Thanks Bill

[canadianim]

1. Can they reduce the pipe size from 3inch to 2 inch BEFORE they go through the outside wall, or after the pipe is outside (and then elbow it up and throught the deck - there are 3 elbows required after the pipe is outside)

2. Can the INTAKE remain in the house, if there is enough ventilation in the furnace room?

Again, it's a Rheem Prestige 90.

THANKS !!!!

[beenthere]

Refer to the install instructions for when they can reduce.
Since its going to go through the deck yet, I think you need to maintain the 3" untill outside.
Most 90% units, lose some efficiency if they use indoor air.
Refer to the install manual for proper combustion air intake locations.

You need 50 CF of free air space per 1000 BTUs input. So if your furnace is a 100,000 BTU input, you need 5000 CF of space in your basement. Or vents allowing flow from other rooms into the are where the furnace is located.

[canadianim]

The unit is 75,000 BTU and the furnace room was designed with two unobstructed vents for that purpose. The basement itself is about 1000sq feet and 90% of it is open space (no walls), so it should get decent intake ventilation.

He thanks you for your advice and will now use 3 inch until he gets outside the wall.

thanks for you guidance and advice - and FAST response from all !

[beenthere]

You are both welcome.

[firecontrol]

*puts monitor back right side up*

Ok.... that makes more sense.

The contractor has the installation manual that tells him what he can and can't do with reguards with installing your new furnace. He also has to conform to all applicable code requirements. Let them worry about the number of elbows etc.. I doubt there would be any issue with elbow count from what you've explained and showed.

His question, I'm thinking, was whether you would mind the venting coming up through your deck and terminating there. That's a personal preference that he left up to you. Count yourself lucky that you were home to be asked and didn't return to find something done that you were going to be upset with.