Multipart access covers combine standard size covers in multiple rows and lengths. They are used when a single-part cover does not offer a large enough clear opening or if smaller individual covers are required for easy lifting. Certain applications may require that a cover offers a certain degree of fire resistance.
A fire-rated cover is a standard access cover system that has a fire-rated barrier installed beneath it to protect against flames, smoke, fumes and heat for up to two hours as required in AS 1530. Each system is custom made and ACO works closely with its clients to supply a suitable fire-rated system for the requirements of each application.
The following information is intended as a guide to the factors involved in specifying a fire cover.
Any standard cover can be supplied as a fire-rated cover, but due to the addition of the fire barrier, the clear opening will be reduced. Pit rebates support the fire-resistant barrier. The fire-resistant barrier will need to be supported by either a formed ledge in the pit or a fabricated ledge. These ledges are used to support the framework which holds the fire resistant-material (see image).
Safety gates may be required in certain states to protect the non-load bearing fire rated barrier. Safety gates fit to the sides of the pit below the cover and a safety catch is required to hold the gates open to prevent them falling closed and trapping someone inside the pit.
Fire Resistant Material
An asbestos-free material rated to two hours to AS 1530 is standard, although higher ratings are also available.