Chimney Terminals

Question 1

Whats the required air gap for a flue passing through a ceiling or wall

Answer 1

25mm

Question 2

Approved terminals should have an approved opening of how much?

Answer 2

Between 6-16mm

Question 3

If chimney has a diameter of 170mm or less, what should it have?

Answer 3

Approved terminal

Question 4

Chimneys passing through tilted or slated roofing shall be weatherproofed by use of what? And what’s the minimum upstand where the flue passes roof?

Answer 4

FLASHING and 150mm

Question 5

How often should terminal hatches be?

Answer 5

1.5m

Question 6

What size should the Internal hatch be?

Answer 6

300mm x 300mm

Question 7

Ridge terminals which are open on all 4 sides shall be at least how far apart?

Answer 7

300mm

Question 8

How far should a terminal be from a window?

Answer 8

300mm

Question 9

How often should a flue be supported?

Answer 9

Every 1.5m

Question 10

Name 3 reasons for having a terminal?

Answer 10

1. Aids in evacuation of flue gases to the outside
2. Prevents entry of rain and foreign matter.
3. Reduce down draught

Question 11

Name the components of an open Flue system?

Answer 11

Primary flue, secondary flue, draught diverted and a terminal

Question 12

What angle should the bends be for an open Flue?

Answer 12

45 degrees

Question 13

How often should an open Flue be supported with clips?

Answer 13

Max every 1.8m apart and before and after at every change of direction

Question 14

How far away from combustible material should the flue be?

Answer 14

2.5mm

Question 15

Whats the difference between an open Flue and a room sealed?

Answer 15

Open Flue has 1 job. Room sealed has two. Seen by the terminal. An open Flue gas fire will burn your fingers, room sealed will not.

Question 16

At what height should a terminal guard be fitted?

Answer 16

Terminal fitted less than 2m