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Heat recovery ventilators located in cold climates
will frost up. At that point, a defrost element
or defrost damper system will automatically
operate and the HRV will defrost.

The melt water / condensate collects in the HRV
drain pans and then is fed by tubing to a bucket,
floor drain or other plumbing.

When the HRV has two drains, BOTH tubes
(forming the yoke) need to be sealed via a trap.

The picture below shows a very common
mistake, i.e. as only one branch of the yoke
has a trap.
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Heat recovery ventilator exterior fresh air intake
louvre / hood meshes need to be cleaned regularly otherwise the HRV system will be thrown out of balance and will not perform properly
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Heat recovery ventilators are better than air
exchangers as they reclaim heat out of the
out-going air to temper the in-coming air and
are therefore more economical to operate.

HRVs need regular cleaning.
There are usually two air filter and sometimes
 a Hepa filter in the HRV.

The HRV exterior fresh air intake louvre's mesh
needs to be kept clear (sometimes they get
clogged so badly they look like a piece of felt).

The exterior HRV fresh air intake and stale air
exhaust louvres / vents should be at least 18
inches above grade / surface and be installed
at 6 ft o.c. The intake should not be located
near a dryer vent, central vac port or  a
heating system vent terminal.

HRV systems should be PROFESSIONALLY
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Should never be on a roof as they will likely
never be cleaned.
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Tree roots can really clog up foundation drain tile systems, including lateral pipes and especially
older Terra cotta type tiles.

Planting trees, especially Weeping Willow and
cedar trees close to a house should be avoided.

Years can go by without any apparent problems
posed by trees and shrubs but when extremely
dry weather comes along, the trees roots
descend further in search of water et voila.
"The next time you have a heavy rainstorm or
melt, that always dry foundation suddenly
has water. " Why? Roots clogging the drain
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ABS DWV pipe is not certified to ULC 636
standard for venting of gas-burning appliances
and does not meet CSA Standard B149.1
Natural Gas and Propane Installation Code.

PCV and CPVC pipe with  compatible primer
and solvent cement meet the ULC 636 standard.
CPVC is rated for flue gases with temperature
up to 90 degrees C. while PVC is rated up to
65 degrees C.
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Insulation blocking air-flow at eave soffit
will usually result in humidity-related roof
problems (premature aging of shingle or
bituminous roofing, deflection of roof
sheathing, truss-uplift, damp roof insulation,
ice-dams, etc.) and / or overheating of roof-
space resulting in higher air conditioning
costs and lower comfort levels.

It is critical that sufficient air flows into the
roof-space from a lower level (eave soffit)
and exits the roof via higher level gable
louvres, ridge-vents, sloped roof louvres /
vents, turbines, mechanical vents, etc.
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#Dryer -vents
In cold weather, this is what can happen if
the siding is installed over the end of the
dryer duct and the dryer vent is not installed.
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For the proper positioning, sloping and securing
of eaves-troughs / roof gutters, roof eave fascia
should be flat not the stepped type shown in the

Where the eave fascia is not flat, pressure-treated
wood shims or brake-formed aluminum channels
can be installed between the fascia and the
eave-trough in order to properly position, slope and
secure the eave-trough.

Since one of the main reasons for installing  eave-
trough is to take water away from foundations,
downspouts should be located at the down-hill side
of the building and when possible, led 6 feet from
the foundation.

If the neighboring trees are deciduous, not pine,
spruce, juniper or fir, consider aluminum gutter
guards to reduce trough maintenance.

Where the roof pitch or slope is greater than 6/12,
extra, compatible strapping / securement of eave-
troughs to  the roof system, especially metal roofing,
is advised.
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