Blodgett 900 SERIES manual Direct Flue Arrangement, Venting Problems, Installing the draft hood

		Installation
		Ventilation
DIRECT FLUE ARRANGEMENT
When the installation of a mechanically driven ex-		Flue
haust hood is impractical the oven may be vented
by a direct flue arrangement.		Draft Hood
WARNING!!
It is essential that the direct flue be
installed as follows. Incorrect installation
will result in unsatisfactory baking and
oven damage.
The flue must be class B or better with a diameter		Front of
of 6” (15 cm). The height of the flue should rise 6-8		Oven
ft (2-2.5 m) above the roof of the building or any
proximate structure. Never direct vent the oven
into a hood. The flue should be capped with a UL
Listed type vent cap to isolate the unit from exter-
nal environmental conditions.		Figure 7
The direct vent cannot replace air consumed and
vented by the oven. Provisions must be made to	VENTING PROBLEMS
supply the room with sufficient make-up air. To in-
	Blodgett gas deck ovens use the natural principal
crease the supply air entering the room, a ventila-
tion expert should be consulted.	of heat rising as the basic method of ventilation. If
Installing the draft hood	the venting of any deck oven is either restricted or
	forced in any way the baking characteristics of the
Ovens ordered for direct venting are supplied with	oven will be adversely affected.
a draft hood. Install the draft hood as follows:	Examples of forced venting include:
1. Place the draft hood over the flue connector.
	D	installation of a fan in a direct vent pipe
See Figure 7.
	D	use of a canopy type hood without the draft di-
2. Secure both ends with the sheet metal screws
		verter
provided.
	Examples of restricted venting include:
	D	use of tees and elbows
	D	long horizontal runs

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