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Increasing Efficiency and Hot Air Movement
A number of different options are available to the homeowner to maximize
the heat output and air movement to different rooms in the house.
Grills: If your Ravelle™ 42 gas fireplace is installed in a cabinet or a chase,
heat can be drawn from these enclosures and circulated into the living
area by cutting one or two openings covered by a register or Grill.
Whole Home Comfort System: The Whole Home Comfort System is a
very inexpensive and efficient way to move air into and heat other areas
of the house. In the bottom of the Ravelle™ 42 gas fireplace are four inch
and Six inch (152 mm) diameter knock-out plates. Four inch (102 mm)
or six inch (152 mm) diameter return air ducting may be fastened to the
bottom of the fireplace, run into another room in the house and terminated
with a grill. When the fireplace is burning, with or without the fireplace
fan running, air is drawn from a distant room (lowering the pressure in
that room) through the return air duct into the bottom of the fireplace.
The air then passes through the outer shell and heat exchanger of the
fireplace and into the room in which the fireplace is located. The hot air
in the fireplace room moves through an open doorway or hall into the
low pressure room from which the air was drawn. This system functions
well by convection even without the use of the fireplace fan. Six inch (152
mm) diameter ducting moves more air than four inch diameter ducting.
Ducting in uninsulated areas of a house (for example in the crawl space)
should be wrapped in insulation to ensure maximum heat retention. Check
local building codes - some areas may require firestops when the duct
passes from room to room.
Figure 33
Figure 34
Figure 35
Opening and Grill into
Adjoining Room
Possible Opening
and Grill Locations
on Cabinet
Note: Grill can be in the Wall, Ceiling, or Floor.
Up to 100 Feet (30.5M)
Maximum Run
Starter Ring
4” (102mm) or
6” (152mm)Duct
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.