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.
Sign up to receive email updates when this page changes. The Texas state sales and use tax rate is 6.25%, but local taxing jurisdictions (cities, counties, special purpose districts, and transit authorities) may also impose sales and use tax up to 2% for a total maximum combined rate of 8.25%.