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City Series

installation

Vertical Termination 4" x 6-7/8" venting

Diagram 1: The upper half of the l ashing is

installed under the rooi ng material and not

nailed down until the chimney is installed.

This allows for small adjustments.

Maintain the 1-½” clearance (air space) to combustibles when passing

through ceilings, walls, l oors, enclosures, attic rafters or other nearby

combustibles. Do not pack air spaces with insulation. Check Venting
sections for the maximum vertical rise of the venting system and the

maximum horizontal of set limitations.

Ensure that you maintain clearances around enclosures, walls, below

or above l oors, l oor joists, etc. Each appliance has dif erent clearance

requirements (top,sides,bottom). See specii c appliance manual for details.

Set the appliance in its desired position. Drop a plumb bob down from

the ceiling/l oor joist to the position of the appliance l ue exit and mark

the location where the vent will penetrate the ceiling. Drill a small hole
at this point. Next drop a plumb bob from the roof to the hole previously
drilled at the ceiling level and mark the spot where the vent will penetrate
the roof.

Determine the overall height of the chimney from the top of the appliance

to the underside of the l ashing. If required cut the l exible inner and outer

pipe to the desired length up to a maximum of 20 feet.

7. Put a bead of Mill-Pac around the 4 inch collar on the appliance and slide

the inner l ex pipe over the inner collar of the appliance and secure with

a minimum of 3 screws.

8. Install 4 inch spacers around 4 inch l ex.

9. Repeat Step 7 to install the outer pipe to the outer collar of the appliance

Note:

If an of set is necessary in the attic or l oor joists it is important to

support the vent pipe every 3 feet to avoid excessive stress and
sagging of the vent pipe. Wall straps are provided (3 in total) for this
purpose. All round/plumbers strapping may also be used if further
supports are required.

10. Attach the rigid pipe section to the adaptor by using Mill-Pac on the inner/

outer pipe. Use 3 screws to secure outer pipe.

Cut a hole in the roof centered on the small hole placed in the roof in the
previous steps. The hole should be a minimum of 10-¼ inches. The hole
may be round and or square.

Slip the l ashing under the shingles and line up l ashing so it is centered

to the hole (shingles should overlap half of the l ashing) as per Diagram

4" X 6-7/8" VENTING - VERTICAL FLEX VENT KIT (946-755)

11. Secure inner l ex pipe to pipe adaptor by using Mill-Pac over the adaptor.

Slide the inner pipe over adaptor and secure with 3 screws.

12. Repeat Step 11 to secure outer l ex.

Diagram 4

14. Put a bead of caulking on the exterior between the outer pipe and l ashing

to prevent water from penetrating the chimney system.

15. Slide storm collar over pipe length until it reaches the l ashing.

16. Install termination cap by twist locking it.

17. Secure the l ashing to the roof using screws

Note

: Any closets or storage spaces which the vent passes through must

be enclosed.

Roof Pitch Minimum Vent Height

Feet Meters

l at to 7/12

0.61

over 7/12 to 8/12

0.61

over 8/12 to 9/12

0.61

over 9/12 to 10/12

2.5

0.76

over 10/12 to 11/12

3.25

0.99

over 11/12 to 12/12

1.22

over 12/12 to 14/12

1.52

over 14/12 to 16/12

1.83

over 16/12 to 18/12

2.13

over 18/12 to 20/12

7.5

2.29

over 20/12 to 21/12

2.44

Diagram 3

Diagram 3a

Diagram 3b

13. Slide the i nished length up towards the l ashing ensuring the length of

pipe is a minimum of 2 feet measured from the top of the roof. Level the
chimney and secure using the roof support provided with kit to bottom
side of the roof as shown using a minimum of 2 screws per side- see
Diagram 3b. See Diagram 4 for roof pitch and height requirements. See

Diagram 3a for securing method if 2 ft. is insuﬃ cient and additional lengths

are required, this may be purchased separately. See Simpson Duravent
components list in the instruction manual for part numbers.

Flex Pipe

Ceiling Firestop

Roof Support / Brace

Flashing

Storm Collar

Termination Cap

Ceiling Firestop

Enclosure

Flex Pipe

Ceiling Firestop