Yes. The Allegro 2041 Bitrex Fit Test Kit performs qualitative (pass/fail) OSHA-compliant fit testing for disposable and reusable dust and mist (particulate) respirators. It uses Bitrex (denatonium benzoate), a bitter-tasting aerosol: if the wearer detects the bitter taste during the exercises, the respirator has a leak and fails the fit. It's a cost-effective, equipment-light way for employers to meet the annual fit-test requirement for negative-pressure particulate respirators such as N95 filtering facepieces and half-mask respirators with particulate filters.

Yes. The Allegro 2041 Bitrex Fit Test Kit provides qualitative fit testing (QLFT) that follows the Bitrex (Denatonium Benzoate) Solution Aerosol protocol accepted under OSHA 29 CFR 1910.134, Appendix A. Qualitative fit testing relies on the wearer's taste response and is OSHA-accepted for negative-pressure particulate (dust and mist) respirators.

The Allegro 2041 kit works in two stages using a bitter-tasting aerosol. First, a sensitivity check with the sensitivity nebulizer and Sensitivity Solution establishes that the person can taste Bitrex (denatonium benzoate). Then, wearing the respirator under the test hood, the operator uses the test nebulizer and Test Solution to release the bitter aerosol around the mask while the wearer performs standard exercises. If the wearer tastes bitterness, aerosol is leaking in and the fit fails; if not, the respirator passes.

Bitrex is the brand name for denatonium benzoate, one of the most bitter substances known. In the Allegro 2041 kit it is aerosolized as the test agent: because humans detect it at very low concentrations, any leakage past a respirator seal produces an unmistakable bitter taste, signaling a poor fit. Allegro notes that Bitrex has been found safer than saccharin tests while producing identical results.

The Allegro 2041 Bitrex kit is designed for qualitative fit testing of disposable and reusable dust and mist (particulate) respirators — for example N95 filtering facepieces and half-mask respirators fitted with particulate filters. Qualitative (taste-based) methods like Bitrex are used for negative-pressure particulate respirators; they are not used to fit test respirators that require quantitative testing, such as those used in higher-hazard atmospheres.

Both are OSHA-accepted qualitative fit test methods, and Allegro offers each (the 2041 uses bitter Bitrex; the companion 2040 uses sweet saccharin). Per Allegro, Bitrex has been found safer than saccharin tests while producing identical results. The choice usually comes down to taste preference and program consistency — many users pick Bitrex because its strong bitter taste is hard to miss when there's a leak.

The Allegro 2041 Bitrex Fit Test Kit includes: a reusable test hood, a sensitivity nebulizer, a test nebulizer (with atomizer), a wire cleaner, a box of Sensitivity Solution (6 glass ampules), and a box of Test Solution (6 glass ampules). The hood is poly-coated with a clear viewing window and surged seams. Free shipping is included from Industrial Safety Products.

Each Bitrex solution ampule holds 2.5 cc and averages about 3–5 fit tests per tube, so the six-ampule boxes support a batch of testing before you need refills. Replacements are available separately: 2041-11K Bitter Sensitivity Solution (6 per box), 2041-12K Bitter Test Solution (6 per box), and 2040-08N replacement nebulizer (each). The glass ampules are single-use with a pre-drilled cap and plastic sheath to guard against broken glass.

The Allegro 2041 nebulizer converts about 5 cc of liquid into an aerosol with a 0.3 to 5.0 micron particle size — the fine mist needed for a valid taste-based fit test. It's made of break-resistant polycarbonate (Lexan) that disassembles easily for washing, comes with an extra jet and replaceable plastic caps, and measures 2" x 2" x 7" (5.0 x 5.0 x 17.7 cm).

The two solutions serve different steps. The Sensitivity Solution (used without the respirator) confirms the person can actually taste Bitrex and sets their detection threshold — if they can't taste it, the test isn't valid for them. The Test Solution (used with the respirator on, inside the hood) is the stronger aerosol used to detect leaks during the fit exercises. Each is supplied in its own box of six glass ampules and applied with its own nebulizer to avoid cross-contamination.