SERVING THE DFW METROPLEX “Family owned and operated since 1972” package units St. Lic. # TACLA019484E 214-742-7252 Glossary Natural Ventilation In HVAC the movement of outdoor air into a space through intentionally provided openings, such as windows and doors, or through nonpowered ventilatiors or by infiltration. Negative Pressure Condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas. Under this condition, if an opening exists, air will flow from surrounding areas into the negatively pressurized space. Sala Air Conditioning has been serving the DFW area since 1972, providing commercial and residential heating and air conditioning. (Parts, Sales, Service, Installations, and Repairs) Home | Products | Services | Coupons | Contracting  | Contact  | Employment  | About Us   | Sitemap Air Conditioning and Heating Terms Facts to know about air conditioning and heating Contact Air Conditioning Repair Service faq about heating and a/c faq about heating and a/c A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z N Air Conditioning and Heating Terms A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z N