Jerry, that was a fantastic and time consuming response. You must either be bored, have time to kill or really like to help other people. Regardless, I appreciate the response. What was determined is exactly at you said, the location and quantity of combustion air was incorrect eventhough the HVAC contractor and city code inspector approved the installation. What they decided to do is get rid of the attic pipe, install new larger high and low grills in the mechanical room that lead into the...I guess it was the laundry room...then in the laundry room they will install high and low grills that communicate to the main portion of the residence as this too would have been deemed a confined space. I'm glad we got the problem resolved with my clients but this was a builder who had completed approximately 40 units in the this developement assumably with the same setup. My concern is now that each one of these other units will have the exact same problems as the one I just inspected. I know its not my business but shouldn't the city now question the previous installations and maybe contact the owners? Wouldn't the builder be prudent to be proactive and maybe make repairs to units already completed now that a known problem has been disclosed and opens the door for litigation should a problem arise in the other units? Just my thoughts. Thanks for the help.