Complete 1 system a/c repair and preventative maintenance check. Changed filter. Tested mechanical and electrical components. Found dirty blower wheel. Found system slightly low on r410a. Gave quotes on iaq products. Customer is going to have iq air filter installed. Return plenum is 22x28. Return has four 8" ducts and one 12" duct. Customer prepaid for iq air filter. Pulled and cleaned blower wheel. System is cooling at this time.