Cov xov hlau overhead parallel bounded insulated yog ib hom khoom siv lead tshiab raws li cov neeg hlau insulated uas muaj cov xov hlau txawv teb chaws. Kev txhim kho ntawm cov txheej txheem tsim khoom thiab cov qauv, uas muaj qhov zoo ntawm kev tiv taus huab cua, tiv thaiv kev laus, yooj yim rau kev teeb tsa, kev poob kab tsawg, tsis muaj xau, muaj kev nyab xeeb thiab txhim khu kev qha. Muaj yav tom ntej dav hauv lub network fais fab tsawg hauv nroog.
