Real Estate Forum

HVAC Guy wrote:
> Full-Quoter who is incapable of proper editing Abby Normal wrote:
> 
>
> Nope.  You just have to read and understand what I'm saying.
> 
>
> And what would that do?
>
> A draft hood is essentially a hole in bottom of the flue.  The hole
> allows warm, household air to be pulled into the flue and out the
> chimney.  I question the necessity of the draft hood.  If there's an
> air imbalance in the house (or some return air vents are blocked) then
> combustion products can flow back or be sucked from the flue and into
> the house through that hole.  When the draft hood is working, it's
> pulling warm household air into the flue.  Now why you want to COOL
> the flue gasses as they make their way out the chimney is just
> stupid.  You really don't want the flue gas to cool because you want
> the flue gasses to exit the chimney before it condenses.  By pulling
> household air into the flue from the draft hood, you are cooling the
> flue gasses (because even warm household air is a lot colder than the
> combustion gas).
>
> Dilution air is just another term for the warm household air that gets
> pulled into the draft hood.  It could also mean outside air that is
> added to indoor air, but the proper term for that would be "makeup
> air"  - but that's not part of this discussion.
>
> Heat recovery ventilator is completely unrelated to what I'm talking
> about.
>
> The HRV is a useless piece of shit.  It's fans consume energy, it's
> filters and drains require maintainence, and it will no doubt require
> repair from time to time.  It's simpler and more cost-effective to
> simply have the furnace pull some small amount of return air directly
> from the outside if you need some air turn-over in the house.  In a
> normal house, you've got a close dryer and a kitchen fan and maybe one
> or two bathroom fans that are pushing household air out of the house,
> so there will be some natural air leakage into the house to make up
> for that anyways.
>
> ----------------
> The really stupid thing about the HRV is that in the spring and fall,
> when the outdoor air is cool (particularly at night) but the house is
> warm, what you really want to do is to connect your furnace air return
> directly to an outside intake, and basically fill your house with
> outdoor air (instead of running the A/C).  In that situation the HRV
> works against you - you don't want to pre-heat the outside intake air
> with exhausted indoor air.  How many modern HVAC systems are ducted
> and gated to allow the homeowner to cool their house by filling it
> directly from an outside air intake (and dumping the return air
> directly to an outside exhaust vent) ?
> ----------------
>
> Again, what is wrong with taking a 25+ year old furnace (a furnace
> with a draft hood, open burners (not inshot) and running outside air
> directly to the cabinet (to the primary air intake grill and also to
> the draft hood intake) so that primary air and draft air come directly
> from outside the house?
>
> In that situation, combustion gas has NO way to enter the household
> air, no matter how tightly the house is sealed, and warm household air
> can't leave the house via the furnace.  And it requires no motors,
> gates or dampers or control electronics.  Just some flexible ducting.

You [HVAC Gay Guy] are a clueless piece of s**t.

--
Zyp

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