Batch Washers

Batch washers come in single-door and double-door pass-through models. Pass-through models are much preferred, because they provide for the separation of clean and soiled sides of the cage sanitation area. They come in two basic sizes and types. The most common is the floor-loading models, often referred to as "cage and rack washers" because entire racks of cages can be rolled into the washer. Typically, they have washing chambers sized wide enough for one cage rack, deep enough to hold one or two cages racks, and tall enough to hold the tallest mobile cage racks in the facility (nominal maximum rodent rack size = 0.6 m wide, 1.8 m long, 2 m high; dog and primate cages may be larger, e.g., 1 m wide). Cage and rack washers are best suited for washing large cages used for housing rabbits, dogs, nonhuman primates, etc. They are typically pit mounted to make the washer floor level with the room floor (Figure 8.20), and while it is possible to ramp up to the washer floor, this presents a potentially

Figure 8.20 A view of a pair of batch-type cage and rack washers from the clean side of the cage sanitation area that are pit mounted to make the washer floor level with the room floor. Note the exhaust fume hoods at the ceiling and the grate-covered pit in front of the washers.

dangerous ergonomic problem (Figure 8.21). With appropriate wash racks, they can also be used

Figure 8.21 A batch-type cage and rack washer that is not pit mounted, thus requiring a ramp to load rolling equipment into the washer. Pit mounting is much preferred in that it avoids the potentially dangerous ergonomic problems associated with the ramp. The wash rack alongside the washer is useful for holding small cages and other small equipment in the cage and rack washer.

Figure 8.21 A batch-type cage and rack washer that is not pit mounted, thus requiring a ramp to load rolling equipment into the washer. Pit mounting is much preferred in that it avoids the potentially dangerous ergonomic problems associated with the ramp. The wash rack alongside the washer is useful for holding small cages and other small equipment in the cage and rack washer.

effectively for washing rodent shoebox-type cages (Figure 8.21). A second type of batch washer, often called a "cabinet washer," may have most of the features of the cage and rack washer except that it has a much smaller chamber, e.g., 122 cm (48 in) wide x 79 cm (31 in) high x 86 cm (34 in), with the bottom of the wash chamber being approximately 91 cm (36 in) off the floor. This type of washer is suitable for very small facilities that use only cages that can be safely lifted up into the chamber. Some larger facilities may have one for washing animal watering bottles, feed pans, and small cage parts. An optional feature on cage and rack washers is to have saddle tanks that store the water from either or both the alkaline detergent wash and acid rinse cycles so that it can be reused to conserve water and chemicals.

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