I ONLY NEED $6\mathrm{.}7$ ANSWERED PLASES DO NOT ANSWER $6\mathrm{.}1$ AND $6\mathrm{.}2$ THESE ARE ADDED FOR QUESTION $6\mathrm{.}7!!!!!!$

$6\mathrm{.}7.$ Refer to Examples $6\mathrm{.}1$ and $6\mathrm{.}2.($a$)$ Estimate the infiltration rates for the windward and side doors for a low traffic rate. $($b$)$ Estimate the curtain wall infiltration for the first floor. $($c$)$ Compute the heating load due to infiltration for the first floor if the building is located in Charleston, WV$.$