Midco Economite RE4400B / RE4400BA - Manual (Page 4)

The Vent Connector shall be installed so as to avoid turns or other construction features
which create excessive resistance to flow of vent gas. It shall be installed without any dips or
sags and shall slope upward at least 1/4" per foot.
A manually operated damper shall not be placed in the Vent Connector or chimney of
any gas utilization equipment.
The Vent Connector shall be
firmly attached to draft hood outlets
and flue collars. Joints between
sections of connector piping shall
be fastened by sheet-metal screws
or other approved means. The Vent
Connector shall be supported for
the design and weight of the
material employed to maintain
clearance and prevent physical
damage and separation of joints.
A draft hood or a barometric
draft regulator shall be installed in
the same room or enclosure as the
equipment in such a manner as to
prevent any difference in the
pressure between the hood or
regulator and the combustion air
supply (see Figures 3 and 4). In no
case shall the relief opening of the
draft hood or barometric draft
regulator be located at a point lower
than the top of the highest flue
passage in the equipment.
Gas utilization equipment requiring controlled draft may be equipped with a listed double
acting barometric draft regulator, if approved by local codes (see Figure 4).
A device which will automatically shut off gas to the burner in the event of sustained
backdraft is required. It shall be of the listed manual reset type and installed and adjusted by
a qualified service technician in accordance with the manufacturer’s instructions.
Refer to gas utilization equipment manufacturer for recommended vent connection
requirements.
Part 1
Installation
Continued
4
Part 1 Installation
Figure 3: Recommended Locations for Draft Hoods
Figure 4: Location for Barometric Draft Regulators
Note: Figure 3 and 4 :
Copyright by American Gas Association.
Used by permission of the copyright holder.
IV Chimney, Vent
Connector and
Draft Control
Continued