highboy furnace install

dwk

I have a htl 100 olsen furnace and have only about 20 inches between top of furnace and ceiling. Is that enough clearance for a plenium with 6-8 take offs using 6" pipe???

John Mills_5

Is

that enough airflow for a big furnace? Plenum height doesn't sound as bad as 6-8 6" runs.

S Ebels

It depends,,,,,,,,,,,,,

How long do you want the heat exchanger to last?

A six inch run is good for 100 cfm. You should be pushing about 1,200 cfm for 100,000 btu's. Try 12-6" runs. Seriously.

Tom_35

More info

You should also try to leave 7-8" at the top of the plenum as an air buffer. Do not take any of the supply air ducts out of the top of the plenum.

You would probably have more room taking fewer larger openings of the plenum and then installing "wyes" that will feed multiple supply air openings.

Tom A

S Ebels

Code clearance

On a furnace with a limit of under 200* the plenum can be 1" from combustible material. For solid fuel fired equipment it's 6" for a distance of 5 feet from the plenum I think.

Mitch_4

Questions

DWK.

I am a technical representative with the Olsen Division of ECR International.

Please feel free to contact me, and we can give you some assitance regarding your Olsen Furnace.

Regards.

Mike Breault
519-627-0791 x228
ECR International - Olsen Division

"Your Single Source Solution for HVAC Products"

Steve_35

My thoughts exactly, John.

The duct system isn't large enough to support a furnace output that size.

Tom_35

Air Buffer

Steve,

I didn't make myself clear. I meant leaving 6-8" of the plenum with no tap-ins in it at the last 6-8" of the plenum. Many times a plenum will have tap-ins coming out of the cap and at the top of the plenum. This wrecks havoc with proper air distribution leaving the plenum.

Tom A