Specifications include, but are not limited to:. St. Charles County is seeking bids for Pet Adoption Center Engineering and Installation of Make-Up Air Units. . St. Charles County Government Facilities Management Department is seeking bids for the engineering and installation of 2 make-up air units for the Pet Adoption Center. The area of work is Kennel A and B, both kennels are of the same size measuring 90 feet wide, and 20 feet deep with a ceiling height of 14 feet, making the volume of space 25,200 cubic feet. The Vendor must itemize cost for engineering of system performing 10 air changes per hour, the equipment cost and installation for system performing 10 air changes per hour. The cost deducts for 8 and 6.5 air change per hour. The Contractor shall provide a cost for doing the install in 2 phases as well as estimated annual energy usage for each air change criteria with and without an energy recovery wheel.