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The testing equipment includes: 1 hood, 1 hood collar, 1 #1 sprayer (for sensitivity testing), 1 #2 sprayer (for fit testing), 2 sets of sprayer nozzles, 1 bottle of #1 sensitivity testing reagent, and 1 bottle of #2 fit testing reagent. Purpose: It is used to test the fit of tight-fitting respiratory protection devices to the wearer’s face; it is applicable to all dust masks/masks, as well as gas masks/masks equipped with particulate pre-filter cotton. Reagent components: Water, Sodium chloride, Denatonium benzoate. Precautions: Denatonium benzoate is a highly bitter chemical; care should be taken to prevent children from coming into contact with it. If signs of contamination are detected in the reagent, discard it immediately. According to OSHA regulations in the United States, before conducting a suitability test, the person being tested must be informed of the components of the testing reagent, as he or she will be exposed to fine sprays of this reagent during the test. If crystals form in the reagent, tighten the opening of the reagent bottle, soak it in warm water, or shake it vigorously to dissolve the crystals. The 3M TMFT-30 Qualitative Fit Test Device (Bitterness) meets the relevant requirements for fit testing specified in OSHA’s Respiratory Protection Standard 29 CFR 1910.134. Preparation: 1. Put the head cover over the collar, align the center of the window in the head cover with the hole in the collar, and tighten the rope on the head cover before tying it. 2. Pour about 1 teaspoon of #1 reagent into #1 sprayer. 3. Pour an equal amount of #2 reagent into the #2 sprayer. 4. Tighten the reagent bottle cap immediately. Sensitivity test: The purpose of the sensitivity test is to determine whether the subject can detect the reagent being used. A sensitivity reagent is a diluted version of a reagent used for suitability testing. 15 minutes before the test, subjects must not eat, drink beverages (except water), or chew gum. 1. Do not wear a mask; wear a head cover instead. 2. Adjust the position of the headgear so that there is a distance of over 10 centimeters between the subject’s face and the window of the headgear. 3. The subjects are asked to breathe through their mouths and protrude their tongues appropriately. 4. Remove the seal cap from the nozzle of sprayer #1, insert the nozzle into the round hole in the viewing window, compress the air bag, and spray 10 times. Each time you spray, the air bag should be fully flattened, and then allowed to expand completely. The sprayer must be in a vertical position with the air bag facing downward. 5. Ask the subject whether they feel a bitter taste; if so, record whether the subject felt bitterness during the 10 sprays. 6. If no sensation is felt, spray another 10 times to see if the subject experiences sensation; if necessary, spray another 10 times, and record whether the subject feels something after 20 or 30 sprays. 7. If no sensation is felt after 30 sprays, the testing is completed, indicating that the subject should choose another appropriate testing method. 8. Remove the headpiece to eliminate the taste in the subject’s mouth; drinking water can help remove the taste. Suitability test: 1. The subject puts on the respirator and performs a face seal check in accordance with the respirator’s usage instructions to ensure a proper seal. 2. The subjects put on other safety equipment required for work that may affect the fit of the respirator. 3. Put on the headgear and ask the subject to breathe through the mouth with the tongue protruded appropriately. 4. Use a #2 sprayer, and the number of sprays should be the same as that used in the sensitivity test (10, 20, or 30 times), with at least 10 sprays. 5. To maintain the aerosol concentration inside the hood, spray half as many times as the initial number of sprays into the hood every 30 seconds. 6. After spraying, the subjects are asked to perform the following actions, each for 60 seconds: a. Normal breathing — stand in an upright position, breathe at a normal rate, and do not speak. b. Deep breathing — Stand upright and take slow, deep breaths, being careful not to exhale too much. c. Turning the head left and right — Stand upright, slowly turn the head to one side until it reaches the extreme position, then turn it to the other side; inhale at each extreme position. d. Move the head up and down – lower it slowly, then raise it slowly; an inhalation should occur at the highest point of head elevation. e. Speaking — speak loudly and slowly, such as having the subject read a passage. f. Bending motion: have the subject use both hands to touch their feet ； Or, jog in place. g. Normal breathing. 7. At any time, if the subject perceives a bitter taste, it indicates that the respirator is not fitting properly against the subject’s face; in such cases, the fit test should be stopped, the subject should wait for 15 minutes, and then the sensitivity test should be repeated. 8. After the subject readjusted the respirator worn, the fit test was repeated. If bitterness is felt again, it indicates that the subject needs a respirator of a different model or design. 9. If the subject never feels a bitter taste, it indicates that the respirator fits well with the subject’s face, and the respirator can be worn. 10. Regularly inspect the sprayer; if clogging occurs, remove the blockage and repeat the suitability test. Equipment cleaning: After each inspection, or at least after 4 hours of use, pour out the reagent from the sprayer. Under no circumstances should the remaining reagent be poured back into the original container. Rinse the sprayer with warm water to prevent clogging of the nozzle, then let it air dry. Wipe the inside of the head cover with a wet towel or wet wipe to remove the aerosols deposited on it. For mask-type respirators, the mask can be wiped with 3MTM Respirator Wipe 504 after each fit test. Shanghai Hangli Industrial Co., Ltd. Zhao Jiabin 021-64398971