carbon monoxide

My carbon monoxide detector went off recently, so I had the gas company out to test levels at our only gas appliances -- 38000 BTU Rheem* water heater and 80% efficient 88000 BTU furnace sharing flue venting. The gas company measured 45 ppm CO at the top of the unit when it was kicked on (and...

I need advice from professionals. On Jan 27, I realized my gas pack was not operating. No fan, nothing. I looked for a reputable contractor and called one in Huntsville AL. This is a gas pack unit for a commercial/residential building for a small business. The unit services one floor... The...