Search: Posts Made By: ferd42
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09-09-20, 09:40 AM
Replies: 3
Views: 222
Posted By ferd42

Codes require exhausting directly to outdoors. An...

Codes require exhausting directly to outdoors. An Eave Elbow would be OK, as would a Roof Cap. You can't discharge into an eave or an attic.

Then there's this: Sewer Gas...Windy Day...Backdraft...
Replies: 9
Views: 350
Posted By ferd42

Clean the blower wheel while you're at it.

Clean the blower wheel while you're at it.
Replies: 10
Views: 412
Posted By ferd42

Do not attempt to apply UL181 tape over the...

Do not attempt to apply UL181 tape over the illegal cloth tape. Instead, first remove the cloth tape and any of its remaining residue from the duct.

We call the non-fibrous glass insulation...
Replies: 28
Views: 631
Posted By ferd42

Yes, but not before I ask Norm to please excuse...

Yes, but not before I ask Norm to please excuse my "snarkiness". Thanks all!
08-10-20, 11:26 PM
Replies: 6
Views: 239
Posted By ferd42

Acceptable range of airflows at 95,700 output:...

Acceptable range of airflows at 95,700 output: 1,470 CFM @ 60F to 2,940 CFM @ 30 F. So the heating airflow is a LOT more than cooling airflow. If the same air delivery chart applies, Tap 5 is OK, but...
08-10-20, 01:11 PM
Replies: 6
Views: 239
Posted By ferd42

That's a 3 ton 13 SEER. You're delivering about...

That's a 3 ton 13 SEER. You're delivering about 700 CFM/Tom, as compared to the usual permitted range of 350-450. Furnace is 120 MBH input.

One more case of a contractor installing a larger...
Replies: 28
Views: 631
Posted By ferd42

No clue about FPR, first time I've heard of it....

No clue about FPR, first time I've heard of it. TWO MERV 8 to maintain less than 0.10": 32x25 total area. Wasted breath discussing MERV if your supply ducts have debris, of course. You're probably...
08-03-20, 11:43 PM
Replies: 3
Views: 143
Posted By ferd42

I always say "A good job looks bad" with respect...

I always say "A good job looks bad" with respect to duct wrap workmanship. And don't forget the required staples and UL181 tape (bearing UL181... marking).
07-27-20, 06:20 PM
Replies: 21
Views: 664
Posted By ferd42

The thing I like about the Bosch is its constant...

The thing I like about the Bosch is its constant airflow, as opposed to high/low with a "variable speed air handler": Outlet flows do not change, so you don't have to worry about "Hot Head, Cold...
Replies: 9
Views: 359
Posted By ferd42

Great, wouldn't want you or your family at risk...

Great, wouldn't want you or your family at risk in the event of a fire.
Replies: 9
Views: 359
Posted By ferd42

Code violation, assuming your boat cover doesn't...

Code violation, assuming your boat cover doesn't have an HVAC-related UL mark.
Replies: 9
Views: 359
Posted By ferd42

The wrap has to be loosely installed: Don't pull...

The wrap has to be loosely installed: Don't pull it tight "to make it look good"; it needs to look bad to preserve "Installed R Value".
Replies: 9
Views: 359
Posted By ferd42

Cost is always a concern, but what you have has...

Cost is always a concern, but what you have has very little R value, so I'd replace it. As for replacing the existing, clean round ducts with flex, be very careful to stretch it as tight as possible...
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