The temperature dependence of the rate constants for NF(a(1)Delta) quenching by Cl-2, HCl, O-2, and CO over the temperature range 300-480 K have been measured in a flow reactor. The rate constant data were fit by Arrhenius expressions k(T, Cl-2) = 1.6 +/- 1.0 x 10(-11) exp(-1100 +/-250/T), k(T, HCl) = 2.0 +/- 1.0 x 10(-10) exp(-3270 +/- 250/T), k(T, O-2) = 1.5 +/- 0.5 x 10(-14) exp(-300 +/- 150/T) and k(T, CO) = 2.0 +/- 1.0 x 10(-12) exp(-2000 +/- 250/T), cm(3) molecules(-1) s(-1). Reaction mechanisms and possible products are discussed for each reaction.