GB2262544A

GB2262544A - Twin duct vent pipe system

Info

Publication number: GB2262544A
Application number: GB9125799A
Authority: GB
Inventors: Anne Katherine Martin
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-12-04
Filing date: 1991-12-04
Publication date: 1993-06-23
Also published as: GB9125799D0

Abstract

A pipe 20 containing two ducts passes through the external roof line of a building. One duct 14 forms a continuation of the soil and vent pipe 10 and carries foul air from the drainage system to the external air terminating at a vented cowl 12. A smaller inner duct 15 which is available for a number of other uses enters the main pipe 20 below the level of the external roof line 18 at a terminal 16 and leaves at a terminal 17 (designed to prevent the entry of rain or snow) above the level of the external roof line 18. The pipe 20 containing the two ducts can vary in length depending on the use of the inner duct 15. Also the shape. size and position of the terminals 16 and 17 can vary depending on usage of the system. <IMAGE>

Description

VIN DUCT VENT PIPE SYSTEM This invention relates to a length of pipe containing two ducts which passes through the external roof line of a building. One duct forms a continuation of the soil and vent pipe and carries foul air from the drainage system to the external air. The second duct which is available for a number of other uses enters the pipe below the external roof line of the building and terminates above the external roof line.

In domestic situations such as one or two storey houses the soil and vent pipe usually has an internal diameter of lOOmm: this pipe continues to a cowl above roof level passing through a flashing and weathering collar designed for this size of pipe. However, the Building Regulations 1985 only requires a pipe of 75mm internal diameter above the highest branch connection: the twin duct vent pipe system described below shows how by partitioning off part of the pipe this excess area becomes available for a number of other uses.

A lO0mm diameter pipe has a cross sectional area of approximately 7854mm2.

A 75mm diameter pipe has a cross sectional area of approximately 4417mm2.

Allowing for partitioning material between the two ducts 2 this leaves an excess area of approximately 3237mm2. Figures 1 - 5 illustrated in the accompanying drawings show how the main soil and vent pipe is divided allowing one duct to ventilate the drainage system while a smaller inner duct enters the main pipe below roof level and terminates above roof level. There are many possible uses for the inner duct some of which are given at the end of the description.

Figure 1 shows a section through part of the length of the main soil and vent pipe 10 above the level of the highest branch and how it is intercepted by the terminals 16 and 17 to provide an inner duct 15.

The foul air from the drainage system passes up through the main soil and vent pipe 10 and continues through the level of the external roof line 18 via the outer duct 14.

Above the level of terminal 17 the main soil and vent pipe 10 continues to terminate at a cowl 12.

The inner duct 15 joins the main pipe 10 at the terminal 16 below the level of the external roof line 18: exactly where, would depend on the use of this duct. It then continues via the twin duct vent pipe 20 to a terminal 17 above the level of the external roof line 18. The length of the twin duct pipe 20 can vary and would depend on the use of the inner duct 15. The terminal 17 must not allow the entry of rain water into the inner duct 15 and must be high enough above the level of the external roof line 18 of the building to prevent blockage by snow or the entry of snow. This figure shows the terminal 17 provided with a louvre cover to prevent the entry of rain water while allowing the entry or exit of air.

In larger detail Figure 2 shows a cross sectional plan view of how the inner duct 15 leaves the main pipe above roof level of the building at terminal 17: the ventilation of the foul drainage system continuing via the larger duct 14. As in Figure 1 a louvre cover is shoumn to this terminal.

Figure 3 shows a cross sectional plan view of the inner duct 15 joining the main pipe at the lower terminal 16: while the ventilation of the drainage system is provided by the larger outer duct 14. The shape, size and position of terminal 16 would depend on the use of the inner duct 15.

Figure 4 gives another example of preventing the entry of rain water into the inner duct 15 at the terminal 17. The inner duct 15 simply extends to the outside and is turned dolm the external face of the main pipe. Again the outer duct 14 is used for the ventilation of the foul drainage system of the building.

In sketch form Figure 5 shows an external view of the components. The main soil and vent pipe 10 terminating above the external roof line 18 of the building at a cowl 12. Ventilation of the drainage system continuing from the lower section to the upper section via the outer duct 14 within the twin ducted pipe 20. This pipe 20 can be of variable lengths. The inner duct 15 which is available for a variety of other uses joins the system at terminal 16 and leaves at terminal 17.

Some suggestions for uses of the inner duct are: If the inner duct 15 is extended to a room then a mechanical extract appliance could be directly fitted to the lower terminal 16. Extracted air passing through the inner duct 15 to the outside of the building via the upper terminal 17. Also ducting from a mechanical extract appliance could be taken to the lower terminal 16.

The lower terminal 16 could be within the roof space to provide roof void ventilation.

Air could be supplied to a gas appliance by the inner duct 15 or it could be used as a flue for a gas appliance.

If the vent cowl 12 was a minimum of 900mm above terminal 17 then the inner duct 15 could be used to provide ventilation to a room.

If the inner duct 15 is turned down as shown in Figure 4 or the terminal 17 is fitted with a grommet type sealed cover, then the inner duct 15 could be used to carry power cables, telephone cables, TV/HI-Fl aerial cables or satellite dish cables etc., through the external roof line 18 directly into the building.

Claims

1 A pipe containing two ducts that is attached to the soil and vent pipe of the drainage system of a building One duct continues the ventilation of the drainage system and carries foul air to the outside of the building.

The other duct; to be known as the inner duct; is available for a number of other uses.

2 A pipe as claimed in Claim 1 that passes through the external roof line of a building.

3 A pipe as claimed in Claim 1 and Claim 2 that can vary in length.

4 A duct within the pipe as claimed in Claim 1, Claim 2 and Claim 3 that carries foul air from the drainage system of a building to the outside of a building.

5 A duct; known as the inner duct; within the pipe as claimed in Claim 1, Claim 2 and Claim 3 that enters the pipe within a building and terminates outside of a building.

6 A terminal to the inner duct as claimed in Claim 5 that is within a building.

7 A terminal to the inner duct as claimed in Claim 5 that is outside of a building and will prevent the entry of rain or snow.

8 A Twin Duct Vent Pipe System substantially as described herein with reference to Figures 1-5 of the accompanying drawing.