12' x 18' Passive Solar Greenhouse Kit Categories: All Equipment Foundation Anchors Insulated Exhaust Fan Consulting Consulting Greenhouses Built Onsite 12' x 12' Greenhouse Built Onsite 12' x 18' Greenhouse Built Onsite 12' x 24' Greenhouse Built Onsite 12' x 30' Greenhouse Built Onsite 12' x 36' Greenhouse Built Onsite DIY Greenhouse Kits 12' x 12' Passive Solar Greenhouse Kit 12' x 18' Passive Solar Greenhouse Kit 12' x 24' Passive Solar Greenhouse Kit 12' x 30' Passive Solar Greenhouse Kit 12' x 36' Passive Solar Greenhouse Kit All / DIY Greenhouse Kits / 12' x 18' Passive Solar Greenhouse Kit No results found