A flow reactor using the 2F + HN3 reaction to generate NF(a1Δ) has been used to systematically study the reactions of NF(a1Δ) at 300K. The biomolecular self-removal rate constant for NF(a1Δ) was assigned as 5 +/- 2 x 10-12 cm3s-1 . Quenching rate constants by stable molecules span a wide range of values; those for diatomic molecules, with the notable exception of the halogens, generally are less than 1 x 10-14 cm3s-1 , but more reactive molecules, such as C2H4, NH3 and P(CH3)3, have rate constants of l x 10-11 cm3s-1 . For those polyatomic molecules which can act as Lewis bases, a correlation exists between the magnitude of the quenching rate constant and the base strength. The rate constants for the halogens increase dramatically with molecular weight and the rate constant for I2 is (1.5+/-1.0) x 10-10 cm3s-1 . The rate constants for open shell atoms and molecules tend to be smaller than expected; values for NO2, N0, F, N, 0 and C are 0.65 x l0-14 , 0.10 x 10-14, 4 x 10-13 , 5 x 10-13 , 6 x 10-12 and 2.7 x 10-11 cm3s-1, respectively. In general, the NF(a1Δ) quenching rate constants are not so large as to preclue the utilization of complex schemes to extract the stored energy of NF(a1Δ).