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.
Texas Tax Rates. The Texas (TX) state sales tax rate is currently 6.25%. Depending on local municipalities, the total tax rate can be as high as 8.25%. At the local levels, Texas city taxes can range from .25% â 2%; county rates vary from .5% â 1.5%; transit from .25% â 1%; and special purpose districts from .125% â 2%. However, the combined rate of local sales and use taxes cannot exceed 2%, making the highest possible combined tax rate 8.25%.