MORTEX
PRODUCTS
INC
501
TERMINAL
RD
FORT
WORTH,
TX
76106
Page
21
portion of the building with a horizontal distance of ten (10)
feet.
6.
The roof jack must extend at least five (3) ft (0.9 m) above
the highest equipment draft hood or flue collar.
PREVENTING BLOCKAGE BY SNOW
If furnace combustion products enter the building from outdoors
through wall openings adjacent to furnace vent (and air intake)
terminal(s) because of wind and/or snow blockage of
terminal(s), exposure to carbon-monoxide could cause severe
personal injury or death due to carbon monoxide poisoning.
Permanently seal such wall openings.
BLOCKAGE BY SNOW
If furnace combustion products enter the building from outdoors
through wall openings adjacent to furnace vent and air intake
because of wind/or snow blockage of vent terminal, exposure to
carbon-monoxide could cause severe personal injury or death
due to carbon-monoxide poisoning.
The area and the spaces where roof jack pipe penetrates the roof
must be permanently sealed to prevent water leakage and to
prevent entry of combustion products into the living space
The Annual Mean Maximum Daily Snowfall or Average
Maximum Snow Depth can be found at one of the following
websites.
The Annual Mean Maximum Daily Snowfall is
reported by the National Oceanic and Atmospheric
Administration (NOAA) at
https//ncdc.noaa.gov/maps/ncei/rsi
The Average Maximum Snow Depth is reported by
National Resources Canada (NRC) at
https://www.currentresults.com/Weather/Canada/Cities
/snowfall-annual-average.php
Permanently seal any openings where the vent terminal
penetrates the roof. Instructions for proper sealing can be found
in
installing the roof jack vent assembly – Step 7.
THE ROOF JACK VENT ON HI-PITCH ROOF
To install the roof jack RJS 3/12 series on roofs which have a
slope between 4.5/12 and 6/12 you must first install roof saddle.
The combined assembly of the RJS roof jack and the roof saddle
conform to the pitch of the roof. If the roof pitch is greater than
6/12, then the installer will be responsible for providing a
suitable field fabricated roof saddle. Refer to Figure 22:
Figure 23: Roof Jack Slope Saddle
INSTALLING THE ROOF JACK VENT ASSEMBLY
The final assembly procedure for the vent piping is as follows:
1.
A proper installation of the roof jack requires that openings
in the roof and ceiling be on the same vertical center line as
the furnace flue collar.
2.
Once the hole has been cut into the roof, insert the roof jack
body into the opening in the roof.
3.
Align the roof jack inner and outer pipes so the pipes line
up with the inner and outer collars on the top of the furnace.
4.
Pull down the 4” diameter inner roof jack pipe seating it
firmly over the furnace collar. Make sure the inner roof jack
pipe lines up with the furnace collar and the pipe is not at
an angle when connected to the furnace collar. If the roof
jack pipe is at an angle, leaking can occur, causing the
furnace to malfunction.
5.
Pull down the 7” diameter outer roof jack pipe seating it
firmly over the furnace collar. Make sure the outer roof jack
pipe lines up with the furnace collar and the pipe is not at
an angle when connected to the furnace collar. Be sure to
line up the screw hole in the outer pipe with the screw hole
in the furnace collar. If the roof jack pipe is at an angle,
leaking can occur, causing the furnace to malfunction.
6.
Install the optional ceiling trim ring. Refer to accessory part
list in the Service and Maintenance Manual for the part
number.
7.
Caulk or use roof tar under the flashing to seal the roof jack
flashing to the roof. Use roofing nails or screws to secure
the flashing to the roof. Space the nails or screws about 2”
apart.
Figure 24: Roof Jack Crown Assembly
8.
Install roof jack crown assembly and line up the pre-
punched holes in the crown assembly and the roof jack
body. Secure the crown assembly by inserting the screws
into the pre-punched holes and tightening.
Ambient Combustion Air Supply
This type installation will not draw the air required for
combustion from within the space surrounding the appliance
and from areas or rooms adjacent to the space surrounding the
appliance.
An
unconfined space
is not less than 50 cu-ft (1.42 m³) per
1,000 Btu hr. (0.2928 kW) input rating for all of the appliances
installed in that area.
Roof Saddle
Roof Jack
Vent System
CARBON-MONOXIDE POISONING HAZARD
Failure to follow the furnace instructions could result in
severe personal injury or death due to carbon-monoxide
poisoning, if combustion products infiltrate into the
building.
Install the furnace vent at a height of at least 12 inches (30.5
mm) above the Annual Mean Maximum Daily Snowfall or
Average Maximum Snow Depth as described below.
