Heavy Smoke Odor

 The characteristic of heavy smoke odor are:

  • Soot residue appears on horizontal as well as vertical surfaces
  • Cleaning and redecorating of the area where the fire took place and surrounding areas will be required
  • Structural damage will be visible
  • Soot damage will be found outside the room in which the fire took place
  • A high probability of HVAC contamination
  • Soot will be deposited over a wide area

This procedure guide is just for the odor removal, not the cleaning of the area.

Basic Procedure:

  1. Remove the source of the odor if possible.
  2. If an investigation needs to be completed, cover the source with plastic to limit further off gassing of odor-causing vapors.
  3. Do one of the following:
    1. Exhaust air outside using air movers.
    2. Place HEPA air scrubbers with carbon filters into area to start absorbing odors while work is ongoing. If your air scrubber does not have a carbon/charcoal filter available, do one of the following:
      1. Place a hydroxyl generator in the area to start controlling odors.
      2. Use OdorX Crystal Odor Counteractant placed on the pre-filters of your air scrubber.
      3. Place a FreshWave IAQ Gel in front of an air mover.
    3. Prepare deodorizing polymer pre-sealer as follows and apply to all charred areas and attic spaces as needed
      1. 5-Gallon Bucket
      2. 1 Gallon of UnSoot # 1
      3. 1 qt (32 oz) of OdorX 9-D-9
      4. 5 oz of OdorX Last Resort
      5. Add ingredients b, c, and d to the 5-gallon bucket and fill the rest of the bucket with water. Each gallon will cover about 500 square feet of surface area.
    4. Remove all attic insulation.
    5. Have ducts professionally cleaned and sealed.
    6. Clean or remove and replace all horizontal and vertical surfaces.
    7. Thermal fog the area, for most heavy fires Thermo-55 Cherry is recommended.
    8. Seal all areas that were not replaced with a shellac-based primer.


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  1. ODORx 9-D-9 Odor Counteractant

    9-D-9 is a general-purpose smoke odor counteractant specially formulated to manage fire, smoke, and other strong odors. Blended with the finest-quality ingredients, 9-D-9 helps to detoxify and knock down malodors quickly and efficiently.

    • Dilutes 1 to 3 ounces per gallon of water
    • pH: 7.7
    • General-purpose smoke odor counteractant
    • Additive to wall, upholstery, and carpet cleaning solutions
    • NOT for use with thermal foggers

    Starting at: $73.01

  2. ODORx C.O.C. Commercial Granular Odor Absorbent

    On tough restoration jobs with heavy sewage, smoke, decay, and putrefaction odors, turn to ODORx C.O.C. (Crystal Odor Counteractant). This commercial formulation is designed to fight more aggressive odors and can be used in wall cavities, ceiling voids, and hard-to-reach areas.

    • Designed to fight severe odors on restoration jobs
    • Ideal for furnace plenum, attics, voids, and devastated areas
    • Coverage is 2 oz per 100 sq ft of floor area
    • Time release formula; can be placed on foil or in glass dishes
    • Cherry scent

    Starting at: $39.63

  3. ODORx Thermo-55 Cherry Scent

    Thermo-55 is a solvent-based, heat-activated odor counteractant specially formulated for application using a thermal fogging apparatus.

    • Ideal for aggressive odors
    • Ready-to-use, solvent-based formula
    • VOC compliant
    • Treats 128,000 cubic feet
    • Not for use in Electro-Gen 2000

    Starting at: $67.95

  4. Unsmoke Unsoot #1 Encapsulant

    Unsoot #1 helps to improve indoor air quality, particularly in structures affected by fire or smoke damage, including "puff backs" and furnace malfunctions. This product creates a long-lasting barrier that helps prevent the release of particulates, which can irritate breathing and carry strong odors.

    • Great on unlined ductwork
    • Dilutes 4:1 (makes 5 gallons)
    • Coverage: 500-1,000 sq ft per diluted gallon
    • Pale opaque coating
    • pH: 4.9

    Starting at: $46.80

  5. HEPA 1000 Air Scrubber

    Want to earn up to 70% more rental income on your air scrubber? Switch to the HEPA 1000 Air Scrubber. Its cutting-edge design delivers 1,000 CFM of clean, HEPA-filtered air.

    • 1,000 CFM of clean HEPA-filtered air
    • Earn up to 70% more rental income
    • Compact size allows for one-person operation
    • Includes a standard HEPA filter and 2-inch pleated filter
    • Weighs just 73.5 pounds
  6. Titan 4000 Hydroxyl Generator

    Treat up to 40,000 cubic feet and eliminate tough odors with the Titan 4000 Hydroxyl Generator. The Titan is a safer alternative to ozone because you don't have to evacuate the treatment area to use it! 

    • Voltage: 110V
    • Cycles: 50/60 Hertz
    • Amperage: 4 amps
    • Fan output: 5,000 CFM max
    • Max. treatment area: 40,000 cubic ft
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  7. Zinsser B-I-N® Shellac Sealer, Clear (5 GL)

    Fire damage restoration pros love B-I-N because it seals in the acrid smell of fire, as well as sealing in water, soot, and grease stains that plague such jobs.

    • For interior use only
    • Seals pet, smoke, and musty odors
    • Drys clear
    • Covers up to 600 sq ft per gallon+
    • Lightning fast dry times - recoat in 45 minute
  8. Zinsser B-I-N Shellac-Base Primer/Sealer (5 GL)

    Fire damage restoration pros love B-I-N because it seals in the acrid smell of fire, as well as sealing in water, soot, and grease stains that plague such jobs.

    • For interior and exterior use
    • Seals pet, smoke, and musty odors
    • White pigmented
    • Covers up to 500 sq ft per gallon
    • Lightning fast dry; recoat in 45 minutes
  9. 14" x 15" x 1" Activated Carbon Filter

    This 1" Activated Carbon Filter fits the Ultimate 1000 Air Scrubber/Negative Air Machine.

    • Optional 2nd Stage Filter for the HEPA 1000 Air Scrubber
    • Must use 1" Pre-Filter in concert with this filter
    • Listed Size: 14 x 15 x 1 inches
    • Nominal Size: 13.7 x 14.7 x .875 inches

    Starting at: $43.05

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