Dual Drain Design Guidelines:
1. Do not use anti-vortex covers, use only anti-entrapment
covers. Anti-vortex covers present a potential hazard for
hair entanglement, and the smaller open area of some
anti-vortex cover designs results in higher hold down
forces (>15 lbs force) should one of the dual drains be
blocked by a bather.
2. Dual drains should only be constructed with sumps
having 2” connections or larger. Sumps with less than 2”
connections (1-1/2” or less) result in higher hold down
forces (>15 lbs force) should one of the dual drains be
blocked by a bather.
3. Dual drain connector piping (sump to connector tee)
should be 2-1/2” diameter or larger to minimize hold down
forces (<15 lbs force) should one of the dual drains be
blocked by a bather.
4. Dual drain separation distances should be minimum 3
feet and should be kept less than 6 feet. Greater
separation distances must be compensated for through
the use of larger diameter connector piping in order to
minimize hold down forces (<15 lbs force) should one of
the dual drains be blocked by a bather.
