I would urge the use of a disclaimer so that the calcs can be reviewed at the office! Or, just indicate the preliminary results, then review after 24h & send to HO. Anyone using a digital camera to show existing plenums?
BTW, the house appraiser 4 yr ago was using a laser measuring device -- seemed to check with my tape measurements -- but, only room sizes (= longer measurements).
I've recently started using a digital camera. I'll get multiple shots of the job before and after. I've recently started to prefab all the boiler installs if space permits. This is a huge installation efficiancy boost. Pull the old boiler set the new one thats pre piped and prewired and make the connections.