When designing an HVAC system, remember that... When you design an HVAC system, remember that: 1  All AHU rooms must have a floor drain, as condensation from the air will collect in the unit.  One should provide fresh air to every AHU.
The sales tax in Richmond located in Fort Bend is 8.25% which is above the Texas average of 7.25%. All Fort Bend Sales Tax âº.
Andrews, TX Sales Tax Rate. The current total local sales tax rate in Andrews, TX is 8.250%. The December 2016 total local sales tax rate was also 8.250%. Andrews, TX is in Andrews County. Andrews is in the following zip codes: 79714.