Osburn STRATFORD II OB04007 Installation And Operation Manual page 53

Installation rules and advice
• The minimum height of the hot air duct is 68" (1.7 m). It must be measured from the base of the
fireplace to the top of the hot air outlets.
• Do not connect the hot air ducts to a central heating system. The malfunction of the heating system
would overheat the fireplace.
• Do not use insulated flexible ducts as they may overheat.
• Do not use «T» fittings or anything other than those listed below.
• All ducts must be placed vertically or horizontally. Never route the ducting downwards.
• The flaps of the hot air outlet grills must point down to prevent overheating of the adjacent ceilings.
• Always install both hot air outlet grilles when the gravity air distribution kit is installed.
• The hot air outlets can be installed in the same room as the fireplace, or both can be installed in
adjacent rooms or upstairs. If the outlets are installed at different heights, the higher outlet will draw
more heat.
• When forced air kit is installed in conjunction with a gravity kit, the forced air device will draw some
of the air from the gravity kit ducting, therefore reducing its efficiency.
Clearances
• Maximum length of pipes, including elbows: 10' (3 m)
• The maximum number of elbows allowed per duct is two.
• There shall be a clearance of at least 12" (305 mm) between the hot air outlet frame and a ceiling,
side wall or mantle made of flammable material.
• When the duct passes through a wall or floor made of flammable material, a firestop radiation shield
(same as the one used for a class A chimney) must be installed in the opening of the wall or floor.
There must be a clearance of at least 2" (50 mm) between the ducts and the firestop.
12" MIN.
12" MIN.
Installation and Operation Manual - Stratford II
13" X 13"
330mm X 330mm
13" X 13"
330mm X 330mm
Page 53