The 2000 sq ft church retreat dining hall with a 20 ft high cathedral ceiling suffered an intense smoldering smoke fire. The interior has been stripped down to the studs, washed and sprayed with a sealant, however there is still some odor. All HVAC and ductwork has also been removed. The concrete floor was also cleaned and sealed. The Hall is drafty now that all insulation and drywall has been removed. Doors and windows have been replaced, however there is outside air infiltration from the numerous ceiling/ridge/eave vents. We do not want to replace insulation and drywall until the odor has been removed. What ozone machine and application process do you recommend to eliminate the smoke odor. Thank you.