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Old 10-14-2011, 08:59 PM   #16
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Install Help on 75K BTU Garage NG Furnace


raylo32, it is about 832 sq feet, and not knowing the insulation and heat loss, 75k would work. My place is 1642 including basement, and it is 73k. The main living area in my place is 821, and if we turn the heat up to 70 on a day that the wind is not blowing, it will be too warm.

A system should be sized for the coldest day with windchill. If you use the Heating degree days for your area, you can size a system down to the T properly.

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Old 10-14-2011, 09:40 PM   #17
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Install Help on 75K BTU Garage NG Furnace


In Fargo, the wind could be a bigger factor for short term. - Do you have snirt there?

The 12' height to the insulation increases requirement, but is what you have.

Dick
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Old 10-14-2011, 09:41 PM   #18
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Install Help on 75K BTU Garage NG Furnace


live4spd, you are in one of the five coldest cities in the U.S. http://www.farmersalmanac.com/weathe...est-us-cities/ I mean come on, "The Kiwanis Club’s Pancake Karnival fundraiser, the city served out 34,818 pancakes on a freezing cold day in February, breaking the record for the world’s largest pancake feed." When you guys follow the legend of Paul Bunyan, and the fact that you guys know how to follow the Scandinavian heritage.
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Old 10-14-2011, 10:17 PM   #19
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Install Help on 75K BTU Garage NG Furnace


gregzoll -

Good to know about the Kiwanis pancake breakfast. I will try it out when I go up for fishing in Jan-Feb.

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Old 10-14-2011, 10:28 PM   #20
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Install Help on 75K BTU Garage NG Furnace


After reading the above posts I'm wondering what size garage doors was used in the calculation and what insulation rate was used?
You also realize that an 80% 45,000 is only 36,000 out.In other words if you wanted to work on your car you would need to turn on the furnace on Sat morning so that you could work on it sometime Sunday.I really don't think he is going to keep the garage heated to temp all winter long.
Now as far as the venting goes,there is some very little adjustment you can make with differant rain caps but generally you need a ten foot level line from the top of the vent pipe to any part of the house or any part of the roof.Going through the roof is a lot cheaper and easier to do and it looks ok.If you went out the side wall and turned it up so that you got the ten foot rule it would look like hell.
Good luck
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Old 10-14-2011, 10:42 PM   #21
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Install Help on 75K BTU Garage NG Furnace


Quote:
Originally Posted by live4spd View Post
I have a 32x26x12' high garage that I'd like to heat full time for winter. I have purchased a Mr. Heater 75000 BTU Garage/Shop Natural Gas furnace for this task.

I have a question regarding the flue install. Several homes in my area have this type of unit, all were professionally installed with a roof chimney. Since I'm doing it myself, I don't want to put more holes through the roof and would like it to exhaust out an exterior wall.

But I'm not sure how the thimble goes through the wall with respect to the vinyl siding. Does the metal thimble have to go thru a square box vinyl siding peice or get covered by the square box with a hole for the pipe. Also what type of sealant should I use for the thimble against the house wrap / or vinyl siding square? Fire stop caulk?

How far does the exhaust pipe have to be from the soffitt and how far does it have to extend from the exterior wall?

Thanks for the help, trying to do a good job up to code, just not sure of the codes to follow.

Beware that the gas line hook up will be done by a pro, and tested. Not interested in doing connections there.
I have a very similar scenerio as my 75k Beacon Morris is setting in my garage waiting for my HVAC guy to install it.

Very similar sq ft and 30" overhangs , also not fond of roof penatrations.

Here's why there will be a roof vent vs a side vent.

MOISTURE IN THE ATTIC ( ='s rot ) let alone dangerous exhaust gasses.

I can be an exteme do it yourselfer at times and have done gas work at times but this one I'm sitting out.

My Banker, Insurance company and Guardian Angel will sleep a bit sounder I'm sure.

It's sure going to be a treat to hop into a warm car when its 0 out let

alone work out there in your shirt sleeves sipping on a cold one when the family is watching

It's A Wonderful Llife for the umpteenth time.

Last edited by High Gear; 10-14-2011 at 10:45 PM.
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Old 10-15-2011, 06:24 AM   #22
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Install Help on 75K BTU Garage NG Furnace


The quick calcs I made just assumed a detached garage with 4 R10 walls. No special consideration for the garage door since I didn't have the info. I assume in Fargo it will be well insulated.

Just provided the calcs as an order of magnitude estimate... the OP can mess with the calculator to enter more specific values... or just go with the 75K since that seems to be what works for this application up there.

If it was me I think I would probably go with the 75K as I wouldn't keep the garage heated to comfort levels full time as the op intends, I'd just want it to heat up fast when I needed to go in there to work.

Man, I don't know how you guys handle those winters. This ex Florida boy has enough trouble putting up with Maryland winters... and the one winter I spent in Idaho was a real shock. =:O But I can heat my small garage up to 60 degress in an hour or so with a small electric space heater. There are no snowmobiles or snow blowers in there! Could have used a blower 2 winters ago.
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Old 10-15-2011, 07:57 AM   #23
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Install Help on 75K BTU Garage NG Furnace


Well grew up in Jacksonville Beach myself but you get used to it. Lived in Detroit for 10 years as well.

The garage is attached has R19 walls for 2.5 walls. .5 wall is shared with heated space in house. Door wall has one single size door and one double door both are 8' tall.

And my intent is to leave the heat running possibly with a programmable thermostat set to somewhere around 40-50 degrees. I want it warm enough to melt all the snow / ice off the cars at night. During the day I don't really care. Weekends temp will probably go up so I can work and do whatever.
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Old 10-15-2011, 07:58 AM   #24
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Install Help on 75K BTU Garage NG Furnace


Oh yea ceiling is 6" of blowin whatever that turns out to be.

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