It took the Houston Fire Department about two hours to extinguish a blaze that gutted at least 60 units at a northwest-side apartment complex and sent three firefighters to the hospital. The blaze erupted shortly before 5:30 p.m. Tuesday at the Gentry Houston Apartments, 9001 Kempwood. Fire crews were at the scene within minutes. "They had heavy flames right from the get-go," said HFD Capt.