Fire protection services in maryland, virginia, and washington, DC. SINGLE SOURCE. SIMPLICITY. PEACE OF MIND.Guardian fire protection is the mid atlantics premier fire protection company. Over 15,000 customers turn to us for end-to-end fire protection services in maryland, virginia, and washington, DC.Guardian fire Protection provides full service fire protection specializing in new system sales and installation, system inspections, testing, service, maintenance, and repair.