Security Seal Facebook Twitter GooglePlus Pinterest Newsletter Sign-up
The Wall


Joined on January 19, 2012

Last Post on February 25, 2014

Contact User

Recent Posts

1 2 »

Furnace cfm

@ February 25, 2014 12:35 PM in Furnace cfm

Hello to all
What is the rule of thumb/how do you calculate how much cfm you need for a furnace. Like we say 400 cfm for each ton of cooling.
Thanks mike.

Uncle john

@ February 24, 2014 7:09 PM in Old p-tek

Thank you so much. I searched FOREVER for a replacement and this company has it. Thanks Michael

Iron man

@ February 23, 2014 10:13 PM in Bonnet capacity

Thank u for the response. You are right that it's an old furnace as you can see from the picture. I had been told exactly what u said but I wanted confirmation. Also that's a great idea about a condensing unit. But I'm still wondering what exactly does bonnet capacity actually mean. Thanks mike

Chimney liner

@ February 23, 2014 1:10 PM in Bonnet capacity

So if I replace it with an 80% I don't need a liner?

Bonnet capacity

@ February 23, 2014 10:35 AM in Bonnet capacity

Hello to all
What does bonnet capacity mean.
I have a friend that wants to replace his forced hot air system that says input 100000 btu bonnet capacity 80000 btu
I know it differs from afue but is this an 80% furnace?
Thanks Michael

Old p-tek

@ February 20, 2014 9:23 AM in Old p-tek

Hello to all
Does anyone have any suggestions for a replacement for an old weather king unit by embassy ind. model ETW 80-e2. I can't find a replacement that fits into the sleeve. Thanks Michael

Rad btu

@ January 10, 2014 12:20 PM in Rad btu

Hello to all
What is the btu output of this rad. It is 34 inches high and 8 inches across the two columns it's leaking and my neighbor wants to replace it I have not yet bought Dans EDR. Thanks Michael

Fresh Air

@ October 28, 2013 11:04 AM in Fresh Air

I am installing a 45,000 BTU   %80 furnace in a small mechanical room in a finished attic and would like to bring in fresh air for combustion. Is there a calculation to find out what size pipe I need? Thanks, Mike


@ October 17, 2013 10:20 AM in refrigerent traps and subcooling

for the responses. pecmsg, but where do you take the actually the subcooling measurement. Also, you talk about a liquid seal. I understand that to mean, no matter where the outlet to the receiver is, you always have liquid leaving . If the outlet is on the bottom there is liquid there and if its on the top you have a dip tube into the liquid. So on a slightly undercharged  system you should have enough liquid to maintain a liquid seal, why do you get bubbles in the sight glass?  Thanks, Mike.


@ October 17, 2013 9:54 AM in is it true

But I would think that there has to be a reason for that. I read that overfiring can also cause CO because you get incomplete combustion from the extra gas. Did you find any reason for the CO on the new unit? Thanks, Mike.

I have

@ October 16, 2013 12:05 AM in is it true

put a CO tester at the outlet of  the flue and had no reading.

OK but

@ October 16, 2013 12:03 AM in is it true

does a properly operating furnace create dangerous levels of CO if they were somehow vented into the living space.

is it true

@ October 15, 2013 8:18 PM in is it true

that carbon monoxide is only formed from incomplete combustion.  almost everything that I have read online says that this is so. Even the name implies this. Monoxide, lacking the oxygen atom that would normaly be a bibroduct of combustion as carbon dioxide. But many people in the field for a long time insist that if you drill a hole in a furnace heat exchanger (excluding other problems this would create) you will for sure get CO in the house. Thanks, Michael.

i meant

@ October 7, 2013 5:36 PM in refrigerent traps and subcooling

trap not strap

whats the difference

@ October 7, 2013 5:35 PM in refrigerent traps and subcooling

in function of a regular trap vs an inverted strap. Thanks Mike

refrigerent traps and subcooling

@ October 6, 2013 1:00 PM in refrigerent traps and subcooling

what is the function of an inverted suction trap on a system where the condenser is above the evap. And in a refrigeration system with a txv/receiver where does one measure subcooling. Thanks, Michael.


@ October 6, 2013 12:43 PM in noisy belt driven Air Handler

its been a long time but thank you for the responses. I changed the pulley on the motor and they have not called back.

noisy belt driven Air Handler

@ September 2, 2013 11:37 PM in noisy belt driven Air Handler

Hello to all.
 I recently changed a blower motor (1/3 hp) that uses a belt to drive the blower on an old 3 ton air handler that customer states had started to make squeeking type of noises before it died. I replaced the motor and belt and about three weeks later it was making a constant high pitch noise worse than before, not sure where its coming from. I adjusted the pully on the motor to be more in line with the pully of the blower and for the remainder of the time I was there it was fine but it started again soon after that. Now it starts with a constant cycle of humming and then squeeking and again humming then squeeking.
Other important things I noticed are
1)If I remember correctly when I removed the cover the noise stopped
2) The new belt after 3 weeks seemed to have been a lot looser then when first installed.
3)Noise only happens with belt in place
4) blower has pillow type bearings that seem to be properly greased.
Any help would be greatly appreciated, Michael

Finished Attic Heat Gain

@ April 18, 2013 12:46 PM in Finished Attic Heat Gain

Hello to all!
I need to figure out the heat gain for a room in a finished attic (R-11/dark roof). My understanding is that without a "proper" vented attic above, these rooms can get very hot.  Manual J  has "Roof-Ceiling Combination", but the HTM is less than "Ceiling under vented attic". Any help would be appreciated.


@ February 18, 2013 6:14 PM in how much BTU does a person give off

Thanks again, Michael


@ February 18, 2013 6:14 PM in how much BTU does a person give off

Thanks again, Michael


@ February 17, 2013 1:23 PM in how much BTU does a person give off

Dr. Silberstein. I am actually looking for an accurate number. I need to do a heat load calculation for a house of worship and need to be precise.
Thanks agian, Michael.
1 2 »