Confused by air intake and flue setup

[relliott]

Sears Comfortmaker
cat 1
Direct vent
Has induced vent in Unit
also has a damper at base of B vent
also has additional power type vent installed in line
approx 15 foot run
goes out side wall in basement

What gives as far as why additional power venting and can this be an issue?
also the air intake is like a cat 4
never seen this on the 11 year old Unit before.

[relliott]

More pics

[David A. Andersen]

Is required when: "line approx 15 foot run,goes out side wall in basement"

[relliott]

Originally Posted by dandersen

Is required when: "line approx 15 foot run,goes out side wall in basement"

What is required David ?

It has a draft inducer built in to the Unit .
Are you saying additional fan is required?

also what about that air intake?
should it be piped at least to outside of the Unit ?

[rmaday]

Originally Posted by relliott

What gives as far as why additional power venting and can this be an issue?

I think he means that...

Originally Posted by relliott

Has induced vent in Unit
also has a damper at base of B vent
also has additional power type vent installed in line

Originally Posted by dandersen

Is required when: "line approx 15 foot run,goes out side wall in basement"

HTH

[Jeff Merritt]

Bob, A cat I with draft inducer can only push 15 -20 feet tops, depending on the angle how many elbows, the additional blower assembly at the end of the run finished getting the burned fuel out of the FAU/building, some require a damper, You should have just called.

[relliott]

Originally Posted by jmerritt1

Bob, A cat I with draft inducer can only push 15 -20 feet tops, depending on the angle how many elbows, the additional blower assembly at the end of the run finished getting the burned fuel out of the FAU/building, some require a damper, You should have just called.

Got any links to info.

Called who?

I still need to call it out as it does have a slightly dropped elbow besides the hole.


What about that air intake.
It almost looks like a cat 4.

[David A. Andersen]

Bob,

Sorry I'm flooded with calls...

The local codes interpret sidewall venting as needing an induced draft.

You have long distance and a side wall application.

Whether it's right ,wrong or necessary, they may have required it.

[Gary Reecher]

There is information on Field Controls web site http://www.fieldcontrols.com/venting.php
and Tjernlund's web site http://www.tjernlund.com/gassidewall.htm

These are the systems installed to replace the recalled HTPV High Temperature Plastic Vent systems. And is also to be used where sidewall venting is the only option and is not for use with condensing furnaces.

[relliott]

Originally Posted by Gary Reecher

There is information on Field Controls web site http://www.fieldcontrols.com/venting.php
and Tjernlund's web site http://www.tjernlund.com/gassidewall.htm

These are the systems installed to replace the recalled HTPV High Temperature Plastic Vent systems. And is also to be used where sidewall venting is the only option and is not for use with condensing furnaces.

Thanks for the links but what about that air intake?
I know it is ok mto be drawing inside air but this is drawing inside the cabinet Unit air. (no pipe)

[Gary Reecher]

The installation instructions will have to be checked. Normally not an issue unless lack of combustion air is an issue. Which can be verified by a combustion test of flue gases and draft measurement. There are air louvers on the front of the furnace and that is where combustion air is drawn into the furnace from the mechanical room. If combustion air is adequate in the mechanical room combustion test should be good.

[relliott]

Originally Posted by Gary Reecher

The installation instructions will have to be checked. Normally not an issue unless lack of combustion air is an issue. Which can be verified by a combustion test of flue gases and draft measurement. There are air louvers on the front of the furnace and that is where combustion air is drawn into the furnace from the mechanical room. If combustion air is adequate in the mechanical room combustion test should be good.

Yes I know that but issue is if it can be drawn from inside the cabinet .
There is not even a short section of sch 40 .(see pic)

[Gary Reecher]

My first sentence. The manufacturers installation instruction must be checked.

[relliott]

Originally Posted by Gary Reecher

My first sentence. The manufacturers installation instruction must be checked.

Difficult to obtain at 11 years old.
I tried.

[Gary Reecher]

What is the manufacturer and model number?