Salsbury 3700 Series 4C Horizontal Mailboxes Double Column - 10 MB1 Doors and 2 PL5s - Front Loading 4C horizontal mailboxes are U.S.P.S. Approved Manufactured by to USPS-STD-4C Specifications Ideal for apartments, commercial buildings and residential developments Required for new construction and major remodels U.S.P.S. standard 4C requires a minimum of 1 parcel locker for every 10 tenant compartments For indoor or outdoor use Constructed of heavy duty aluminum and stainless steel hardware Feature a durable powder coated finish Doors include a heavy duty cam lock with a dust/rain shield and 3 keys MB1 doors are 13.25 W x 3.25 H in. Available in configurations that are 2 door wide A compartment equivalent to two 3.25 in. high standard doors is used for outgoing mail collection and is labeled Outgoing Mail The front of the outgoing mail compartment is comprised of 2 fixed panels and there is no U.S.P.S. master lock access door Outgoing mail compartment includes a 10.75 W x 0.75 H in. mail slot and weather protection hood Include factory installed 0.75 W x 0.25 D in. trim and 1 or 2 heavy duty rear access door s with latches and continuous hinges Custom engraved placards Custom engraved doors - regular Custom engraved doors - black filled Replacement locks Additional keys Key blanks Size - 31.13 W x 41 H x 17 D in. Color - Aluminum Item Weight - 140 lbs....