Fire-protective cellular service ducting

Details Fire-protective cellular service ducting Fire-protective cellular service ducting

1976-08-13

1978-06-06

Askin, Laramie E.

Electricity: conductors and insulators

Overhead

Towers, poles or posts

52232, 138108, 169 48, 174 68C, 174 99R, 174101, 248 56, H02G 322, A62C 316, E04B 194, F16L 500

Patent

active

040938182

ABSTRACT:
The invention provides an assembly for accommodating service lines which comprises a length of ducting, a block of structural cellular material which fills the internal cross section of the ducting over at least a part of the length of the ducting, said block having cell walls which define cells which extend in the length direction of the ducting and on the cell walls a coating of intumescent material expandable to close the cells under fire conditions. With the block positioned where the ducting passes through a fire-resistant wall, the spread of fire through the ducting is usefully opposed. Using thermoplastic ducting, which has heretofore been contra-indicated, results superior to those obtainable with steel ducting are achieved.

REFERENCES:
patent: 2279791 (1942-04-01), Lamb
patent: 3864883 (1975-02-01), McMarlin
patent: 3932696 (1976-01-01), Fork et al.

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