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.
Click here for a larger sales tax map, or here for a sales tax table. Combined with the state sales tax, the highest sales tax rate in Texas is 8.25% in the cities of Houston, San Antonio, Dallas, Austin and Fort Worth (and 107 other cities). Last updated February 2018 View County Sales Tax Rates