Gas Furnace Basics: Part 1 

very informative much appreciated thank you folks from wxtv!!!!!!!!!!!

Watched this video in 2017 when I didn't know what a heat exchanger was, helped a lot. Now its 2019 and I can throw one of these in now problemo

Very educative thank you regards

real life drama :) enjoyed it!

very good, Thank you

The way this guy pronounces the word “measure” is wild

Thanks it was help me to understand more

great information... follow him exactly and you will be ok. i didn't have all the tools but i was able to do a clean an tune

What brand of furnace is in the Video? Great Video BTW.

Start watching at two minutes. Everything before that is hype and back slapping.

This man is extremely intelligent ! He is probably more honest than myn furnace repairman...700$ for a fan motor...claims my air conditioner has a small leak?

Do people not mow their lawns in Montana?

Cool, thank you! #HansenPlumbing

Nice Video well done ...but I didn't get that if we are getting around 110,000 btu/h instead of 1,38,000 because of above sea level calculations we should use 110,000 btu/h for return duct sizing too and one other thing even if we are get 96,000 btu/h (70% of 1,38,000) we need 192 sq ft insead of 96 sq ft of return duct.

the gas meter reading is 1 cubic feet in 25 sec, it means 2.4 cubic feet per min and 144 cubic feet per hour, right? the heat value of natural gas is 1000 btu/cubic feet, therefore the actual input of gas furnace is 144,000 btu/hour. But why the guy said the actual input is 124,500 btu/cubic feet at 8:30??

Did he measure the height? Maybe that was done off-camera. With an 8ft ceiling height, a 430 sq ft space is needed to suit the code he mentions in the video. That would require a room about 20X21.5 or 16X27, etc. That kind of size isn't uncommon for a basement unit, however, if the basement has been remodeled or recently finished, you may have to get fresh air brought in like he suggested in the video to maximize performance.

He's got warm whiskey in his mug.

Combustion air...if it’s open to the room they enter in from you can use that room for calculating..if it doesn’t have a door.

What is the brand name of this furnace?

If I followed your math correctly, 70% of 138000 is approx 96000. But you said you needed 2 sq in per 1000, so wouldn't it be 96 x 2 = approx 193 sq in?

Needs two square in. for 1K BTU's of output. At 70 percent efficient output of 96k BTU you need at least 192 Square in of duct. With current dimensions of 230 Sq in of duct, its approaching its limits.

@1912RamblerFan01 I found out. It's a Janitrol.

The exhaust pipe takes out a lot of heat through the chimney. What is the purpose of the pipe and would it be OK to block it?

6:22 that's what she said

Duct tape on the flue! How about the entire flue connectors being illegal, you can't use galvanized pipe for flue contactors, they need to be B-vent, it would give you a 1" clearance. But the international mechanical code is a minimum of single wall aluminum vent connects. I agree the earlier comment that they should change that to a 95% furnace. 70% efficient you’re lucky if it would be 60%, with a belt drive, Installed in 1976, Can you say possible heat exchanger heat cracks. Replace it!

The millimeter Peter reader

All that stuff wrong -- and yet it was still heating and not killing anyone.

At 6:31 - unreal.

so the 34 yr old house needs make up air? that basement finish looks at least 25 yrs....ok 1000 for a 3hr high low? sheeeeet

shame to use good outside air for combustion and not stale home air

its there to keeep co2 out the house...

...... what?

editing could really do this video some good

That furnace is a dinosaur. So old.

The drama production is quite high.

Ground wire on NMC going into furnace is a NO NO!

junckitrol lol

Too much suspense and high drama here. The intro with helping with the measuring tape was some slick, pro s&*t.

The duct tape IS 6" from any combustion source. Why is duct tape not useable.

Intros should never be more than 5 seconds long and preferably 2 seconds so as not to waste the viewer's time.

the unit looks really old

Or you could get rid of that inefficient heap of junk,and put in a direct vent 2 stage, variable speed 95% furnace and quit pouring all your heating dollars out the chimney! Combustion air problem solved! .... Just make sure you dont need a chimney liner ;)

This house fuckin' sucks, and needs to be condemned.

you Are wasting a lot of time...

Whats better than bringing a combustion air into that room is STOP USING A NATURAL DRAFT APPLIANCE BECAUSE ITS NOT 1950!!!! Seriously, especially what I see there looks like its from the late 70s. How about some direct vent condensing gas appliances, its 2013 afterall