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any air balancer worth his salt would have given you (at a minimum) a complete static pressure profile which would include the delta P across each component in the duct system. To walk away and only furnish air flow and fan pressure is pathetic. A good balancer hangs in there and helps trouble...

Sometimes the mixed air temp method for determining the percentage of o/a is not practical due to as Mintjulip suggested i.e improper mixing and/or an insufficient temp spread between o/a and return air. What we have done in the past is measure the delta P across the damper, convert that delta...

Our testing found the the freezing point of the prop/water mixture was -15F. From the chart found on the net below the mixture is approximately 46% prop/ 54% water Freezing Point Propylene Glycol Solution (% by mass) 30 40 50 60 Temperature 7 -8 -29 -55 The operating...