HandiFoam® FR (HFO) Low-Pressure Spray Polyurethane Foam (SPF)HandiFoam FR (HFO) low pressure spray polyurethane foam is a two component system designed to fill and insulate large voids and surfaces. HandiFoam FR (HFO)s excellent adhesion properties create a continuous air barrier which completes the building envelope, resulting in improved indoor air quality and lower heating and cooling costs. HandiFoam FR (HFO) is a non flammable, low global warming potential (GWP) product designed for compliance throughout