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.
Denton County, Texas Sales Tax Rate 2017 Up to 8.25%. While many counties do levy a countywide sales tax, Denton County does not. The Texas sales tax of 6.25% applies countywide. Some cities and local governments in Denton County collect additional local sales taxes, which can be as high as 2%.