Welcome to http://www.thinkvacuums.com. Rust is one of the problems you may encounter when purchasing a metal central vacuum. These units are no less qualified when cleaning your home... though over time metal central vacuum durability is considered questionable. These units are susceptible to corrosion, denting, and are much heavier than some of the newer ABS resin made models.
The choice is yours, but as experts we feel the lighter more durable, rust proof material of ABS resin is the direction central vacuum manufactures are heading.
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