Empire Comfort Systems DVLXG55BP90N Installer's Manual page 42

RETURN AIR
If outlets are placed in rooms other than that in which the
fireplace is located, a means of return air is required. This is to
equalize pressure and prevent back flow within the duct system.
This will also assist temperature regulation to these areas.
DUCTING OUTLET PLACEMENT
To achieve even heat distribution, outlets should be positioned in
the corners of rooms furthest from the fireplace location.
• If duct outlets are installed into a room used by an infant,
ensure the temperature stays in the range of 60°F and
70°F by use of a thermostatically controlled shut off valve
in the duct that feeds that room.
• Neglecting to allow backflow of return air to the fireplace
can result in a risk to personal safety to infants or infirm
persons.
• Overheated rooms are NOT SAFE for infants.
• A minimum of 60% return air must discharge into the
same room the fireplace is located.
42
DUCT VENT INSTALLATION
FAN
WARNING
DUCTING
The designs shown below is indicative only and can be adapted
on a case by case basis to suite individual installations.
RESTRICTION ON DUCTING
• 10" Fully open = 78.54in² (1 minimum)
• 1 x 10" Outlet Maximum Restriction 10% = 78.54in² -
10% = 70.68in²
• 2 x 10" Outlet Maximum Restriction 40% = (78.54in² x
2) - 40% = 94.24in²
• 3 x 10" Outlet Maximum Restriction 60% = (78.54in² x
3) - 60% = 94.24in²
Notice: Adding more than 3 x 10" outlets requires the open
surface area of the outlets to be => 94.24in²
• 6" Fully open = 28.27in² (3 minimum = 84.81in²)
• 3 x 6" Outlet Maximum Restriction 10% = 84.81in² -
10% = 76.34in²
• 4 x 6" Outlet Maximum Restriction 30% = (28.27in² x
4) - 30% = 79.16in²
• 5 x 6" Outlet Maximum Restriction 50% = (28.27in² x
5) - 40% = 84.81in²
Notice: Adding extra 6" outlets increases the restriction by 10%
FAN
FIREPLACE
Fan
Fireplace