Posted by 440roadrunner on December 04, 2009 at 20:17:52 from (76.178.187.6):
In Reply to: Sizing a furnace posted by dave2 on December 04, 2009 at 13:25:47:
fixerupper said: (quoted from post at 19:44:15 12/04/09)
The furnace you have is next to new but it still sends up a red flag to me...................... I was given a gas furnace from a house that was maybe 20 years old................. I went into the shop one morning and it was foggy and hot in there and back in the corner by the furnace I saw flames shooting maybe five feet in the air.
I dont see this as a comparison. ANY combustion appliance should see regular maintenance / inspection, something a lot of "you types" on here seem to just hate. Used to be my JOB and I found a lot of potentially dangerous situations. I've seen 5 year old furnaces with cracked (dangerous) heat exchangers, and others nearly 40 years old, that with a gas valve update, were good to go.
Also, just because it's a "furnace" does not mean it needs to be on the floor. You could install a downflow/ horizontal on the ceiling, configured much like a hanging unit heater. A standard upflow used to have to have the burner 18" above floor level, but you could hang it halfway up the wall if you wanted to.
One thing you REALLY want to be aware of is such things as shop welding exhaust hoods or homeshop paint booths---anything with a sizeable exhaust fan. This will cause a massive vacuum in the shop, and will cause vents to revert. Many modern furnaces/ heaters have protection known as "vent spill switches" and they can be installed after the fact.
One other caveat about using a duct furnace as a unit heater with little ductwork. When a furnace blower is devoid of ductwork, it "overamps" the motor. Some units with multi-tap motors can be slowed down with good effect, others, with oversized blowers, need a minimal amount of ductwork/ bonnet to actually restrict airflow and tame down the blower.
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