MONT™ 8 x 4.ft Greenhouse ExtensionDESCRIPTION Model: MONT 4 BK The MONT 4 foot extension kit is specifically designed for the MONT line of greenhouses. The idea is simple, as your gardening greenhouse needs grow so can you greenhouse. The 4 ft extension kit allows for the expansion of your greenhouse. The MONT is proudly made in the USA from start to finish. Each 4ft extension kit comes includes a 2ft x 2ft roof vent with automatic opener and gutters. When ordering your extension kit