R1 Facility Services R1FS CDET Test Prep 2025 Guide, Exams of Building Materials and Systems

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R1 Facility Services R1FS CDET Test Prep 2025 Guide

There are many clothes dryer and exhaust that are and installed causing a real risk of fire. - ANSWERMuch longer --- Improperly Because the dryer duct is usually in diameter, the slightest deposit can reduce the ability to exhaust properly. - ANSWERA" When the complaint is that the dryer is taking too long to dry clothes, the problem is usually - ANSWER-The oxhansl system he leading cause of dryer fires? - ANSWER-Failure to clean From 2008-2010, fire departments responded to an estimated clothes dryer fires each year with an average death toll of with injuries and dollars in loss. - ANSWER-2900 -- 100 --- 35million Lint is the primary fuel, bul are included. - ANSWER Animal nests Dryers may be in an area where they must compete for combustion air with and or . This can lead to a life threatening event. - ANSWER-Gas-fired water heaters ---furnaces --- boilers Exhausting problems are often the result of - ANSWER-Improper installation the duct will be the only way to determine the relative inte exhaust system. - ANSWER-Cleaning What type of ducting is common but not recommended?- ANSWER-Plastic, flexible wire hose The ideal ducting is _ °_ ANSWER-Rigid should never be used as a dryer vent. - ANSWER-PVC Pipe The dryers ruming at unnecessarily higher temperatures can cause _ .- ANSWER- Fires As the numbers of dryers have increased, the percentage of problems related to a lack of cleaning has .- ANSWEF-Increased List two Lesting Lools used to cflectively Lost good airflow capabilities. - ANSWERMagnchclic gallgé, Vane anemometer Dryer exhaust systems shall be of all other venting systems - ANSWEF Independent Flexible connectors used as transition ducts shall be metallic, not more than __ in length and an approved type. - ANSWER-8I. Never use : Or ductwork - ANSWER-Plaslic --- non-metal --- combustible Proper clearance should be noted on the - ANSWER Data plate If it’s a gas dryer, the gas lines must meet and codes. - ANSWER-National --- local Ground wires should never be connected ta . . OF - ANSWER-Plastic plumbing lines --- gas lines --- hot-water pipes T/F: The electrical plug with dryers should be modified if necessary - ANSWER-False The preferred termination is either a dampened wall cap with inch wide opening or movable louvered wall cap. - ANSWER4 inch All turns in the exhaust system, oulside the dryer including the distance from the last turn to the termination, should be separated by at least of straight metal duct. - ANSWER-4 feet The (minimum) height requirement of vertical ducting reduces back pressure and is required by many manufactures for proper dryer performance. - ANSWER-22 inch lille 24 CFR, part 31-80 - ANSWER-Manulactured home construction and safely standard: installation standard for clothes dryers in mobile homes acommonly used dryer exhaust brush is- ANSWER-a 4-inch diameter pellet style brush even with the ball and flexible reds it can be difficult to make a turn through elbow with hand operated brushes - ANSWER-S0 de. a basic hand operated tool is used for cleaning - ANSWER-short dryer exhaust duct there are many systems that come with flexible rods that screw together, if you accidentally push the button you will instantly unscrew a joint and may spend hours trying to retrieve your brush - ANSWER-reverse without a ora long vertical runs could become blocked with loose lint and eventually the brush could pack it tight - ANSWER-blower, vacuum if you choose to blow air to the end of the dryer duct, be sure to locate the blower. the house so the air is blowing Lo the - ANSWER-inside ----- outside a allows the vacuum Lo cereale suction, and clean the duct from the inside al. the same ume - ANSWER-y adapter Never use a (tool) inside the house - ANSWER-gas powered blower the allows you to measure air flow through the dryer exhaust duct, both before and after you clean it - ANSWER-vane anemometer Dryers remove roughly (cu fpm) from the home, it is critical that sufficient area is stance - ANSWER-200 cubic feet of air per minute available and there is litt do not wear (shoes) on roof - ANSWEFleather soled shoes lifting and carrying heavy objects incorrectly _ - ANSWER-can cause back pain & Injury technician should wear to protect lungs - ANSWEF-respirators a potential health hazards associated with animal or bird fecal matter is- ANSWER- histoplasmosis how do you survive a heart altack when you're alone - ANSWER-coughing repeatedly and very vigorously the protects the removal of migratory birds and their nesting - ANSWER-Migratory Bird Trealy Act MBTA) When drill-brnshing, it is extremely important Lo use a drill witha - ANSWER-chuch ladder positioning: ratio, and rungs above roof- ANSWER-4 to 1 ratio ----3 rungs As of 2012, NFIRS states that % of dryer fires were residential. - ANSWER-84% (2010-2014) Fire departments responded to an estimated clothes dryer fires cach year wilh an average death toll of with injuries and dollars in loss. - ANSWER-15000 --- 12 --- 405 —- 247 million Gas dryers are also venting the in addition to the moisture in the clothes. - ANSWER-Products of combustion The most problematic dryer exhaust systems are those that have especially and in the wall. - ANSWER-Long runs --- radial bends The manufactures instructions will determine the and of the exhaust duct system. - ANSWER-Proper materials --- maximum length Few homeowners will realize the dangers of in blocked gas-fired dryer exhaust. - ANSWERCarbon monoxide poisoning Type 1 Clothes Dryer. - ANSWER-Family living environment. Usually is the smallest unit but physically and then function. Type 2 Clothes Dryer - ANSWER-Used in a commercial business. Not designed for use in family living. It can be S, M, or L. A 1/2 inch buildup of lint in a 4-inch duct would be cqnal to a inch reduction in overall diameter reducing the area by % - ANSWER-1 inch ---- 44% When considering max duct length, each is equal to and each is equal to - ANSWER-45 degree bend ---- 2 1/2 ft--- $0 degree bend--- aft All turns in the exhaust system, outside the dryer including the distance from the last turn to the termination, should be separated by at least _ feet of straight metal duct. - ANSWER-4 fool. ANSI/Z223.1- ANSWER-national fuel gas code The standard inch gas supply line must reduce to the inch line of typical gas dryers - ANSWER-1/2 inch ---- 3/8 inch several dryers joined into one duct - ANSWER-"ganged” commercial dryers Clearance: roof vents or plenum chambers (sq in)- ANSWER-14 sq in Minimum dislance between bends - ANSWER-4 fi. If two turns must be closer than 4 ft, allowable length is reduced by f.- ANSWER-10 ft Magnehelic Gage reading greater than indicates a blockage - ANSWER-0.5 inch water column (IN.WC.) Vane anemometer should be used at the - ANSWER-termination vent Magnehelic gauge should be used at - ANSWERtransition Duct material thickness (gauge): Type 1 dryer: Type 2 dryer. - ANSWER-28 gauge --- - 24 gauge electric dryer voltage: - ANSWER-220/240 IRC - ANSWEF-International Residential Code IMC - ANSWEF-International Mechanical Code NCSG - ANSWERNational Chimney Sweep Guild ASTM - ANSWER-American Society for Testing Materials BOCA- ANSWER-Building Officials Code Administrators (model building codes) UL- ANSWER-Underwriters Laboratory (independent non profit, safety certifications organization) _ states that no screws shall point into the duct more than inch - ANSWER- NFPA 211 ---- 1/8 inch NFPA 34- ANSWERNational fuel gas code; codes for installation of gas equipment NPT - ANSWER-National Pipe Thread - conventional pipe thread How many cu ft qualifies a space as a “Confined Space”? - ANSWER312 Cubic ft - volume is less than 30 cu ft per 1,000 btu/hr Diagnosis: Step 4- ANSWER-Intermal diagnosis with video equipment Diagnosis: Step 5 - ANSWER-Documentation, and repair proposal CDET Manual Chapters: Which covers rerouting ducts?- ANSWEF-Chapter 6 If the run is greater than ft, you should try to reroute & shorten it. - ANSWER-25 ft CDET Manual Chapters: Which covers testing and cleaning? - ANSWER-Chapter 7 CDET Manual Chapters: Which covers safety? (ladders, roofs, lifting, OSHAi- ANSWER. Chapter 8 CDET Manual Chapters: Which covers health considerations? (respirators, animals/insects, disease) - ANSWER-Chapter 9 CDET Manual Chapters: Which covers advice to the customer/homeowner? - ANSWER-Chapter 10 CDET Manual Chapters: Which covers NFPA 211? - ANSWER-Chapter 1 and 2 CDET Manual Chapters: Which covers NFPA 34? - ANSWER-Chapter 2 When a dryer is installed in a mobile or manufactured home, it must be . as well as .- ANSWEF-anchored to the floor ---- and supplied with air from outside The maximum length of a dryer vent is feet, unless otherwise specified by the manufacturer. - ANSWER-35 [cel