Floor Drains

Rooms to be used for housing animals using dry bedding cage systems do not require drains. Whether or not to include one is a matter of choice. There are advantages and disadvantages to both, with flexibility being the primary advantage to including them. Other than that, the disadvantages of having them may easily outweigh any other advantages of having them. Disadvantages include installation cost, confounding pest control, especially the control of cockroaches, the potential for sewage backing up into the room, slopping floors that can cause problems when trying to park racks with wheels, underutilized traps drying and thus allowing sewer gas to escape (capping the drain with airtight seals can alleviate this problem, but then the drains are not convenient to use), and taking up space, especially trough drains.

In animal rooms designed for hose-down caging systems, the location of the floor drain is critical to efficient cleaning. Ideally, the drain should be at the low point of an open floor trough located against the sidewalls of the room so that the cages or pens back up to the drain trough but do not cover it. If floor pens are used, the trough should be uncovered and outside the pens, leaving a minimum 46 cm (18 in) access aisle between the pens and the wall. The room floor should be sloped at a minimum of 1.5 cm per m (3/16 in per ft) from a crown in the center of the room to the floor trough on each side of the room or from one side of the room to a trough on the opposite side. The bottom of the trough should slope a minimum of 2 cm per m (1/4 in to the ft) toward a minimum 10 cm (4 in) diameter drain, or 15 cm (6 in) diameter if the drain will service a large number of animals. The drain should have rim and trap flush fittings. In addition, there should be a water source at the highpoint of the trough controlled with the same ball-type valve that controls the flow of water to the flush drain fittings.

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