ASD COURSE EXAM STUDY MATERIAL Flashcards
what are “in place” drying techniques?
Leave the baseboards in place and dry with very dry air
A restorer must know __________ and _________. Once this has been identified the restorer must ________
where the water went
and what is wet
address the wet areas/materials as scope of loss
____ studs often trap moisture in the _______. And it is very prudent to inspect them.
metal studs
“c” channels
water that has caused blown cellulosic insulation to become wet will potentially cause it to pack down and lose ______. This compromising consequence is NOT applicable to ALL types of insulation. If the water rises above the sill plate level, it is appropriate to _________
“r” value
inspect the insulation via inspection holes in the wallboard
Which is more efficient ? Physical extraction or evaporation of water?
Is it more important to know how much water is left behind? or how much was removed?
Physical is more efficient.
How much was left behind.
When a wet carpet is over a cushion use _____ extraction. When wet carpet is glued down use a ______. You will know the extraction is adequate when water cannot be squeezed from the cushion with your hands.
Deep extraction
Light wand
When extracting water from a carpet and pad, the hoses should be the ______ in length and in ______ straight stretches.
shortest in length, long straight stretches.
Heavy face yarn carpet, multi level, made of olefin, looped yarn on a heavyweight pad are ________
difficult to extract from even with deep extraction tools
In place drying techniques are good for category ___. Drying in place will not cause further damage, and there is enough drying equipment available.
1
In a “in place” drying technique you extract from the _____ of the room first. Relocating the furniture on blocks or pads in the extracted area, and then completing extraction of the water from the ______. The furniture is typically left in the _____
center
perimeter
drying chamber
Floor registers can often be ______. Enabling an inspection of the floor materials and its assembly.
Lifted
_________ are very sensitive instruments that can give skewed readings. Technicians should be trained for their use.
Thermohygrometers
100% relative humidity being “saturated” is ________ because air does not hold water. A better phrase is __________ because vapor pressure is produced when a phase change takes place.
Incorrect
Equilibrium vapor pressure
a pound of anything can also be expressed as ______ grains
7000
Humidity ratios are expressed as ______
Grains per pound of dry air
as the environmental humidity decreases so will the _____ and _____ (given at a constant barometric pressure)
vapor pressure and dew point
Some believe a pound of air is approximately __________
14 cubic feet.
Cupping is from the ________. Crowning is from the ________
Bottom and sides
Top
If a permeance “perm” rating is less than ___ it is considered a retarding material. The act of water vapor equalizing within a material is called _______
1.0
vapor diffusion
_______ allows the GREATEST vapor permeance
_______ resists vapor permeance and has a low permeance rating
flat latex paint
high gloss enamel paint
when air is drawn into a building through cracks and crevices, the building is undergoing ________. When the air inside the building is pressurized the air will drive out of the building through the cracks/crevices, this is called _______. Technicians can use these to control odors/contaminants.
infiltration
exfiltration
you can use fans to create pressure differentials between the _______ and ______. This can be an open drying system.
drying chamber
another environment
Restorer should understand the limitations to the amount of ______ that is passed through electrical extension cords. The NEC ____ rule must be followed to safely power the equipment.
Electricity
80%
______ drying techniques usually employ the removal of doors between rooms to prevent restriction of airflow
In place drying
Air movers are placed at ___ degree to ___ degree angels toward a wall spaced at 10-16 feet distance, while not physically touching the wall
15 to 45 degree angles
driving dehumidified air into a wall cavity can _______ from the drying rate from the backside of the wallboard. It is assumed that the more airflow present, the faster the rate of drying. When drawing air out of a contaminated wall cavity, ____ filters should be used.
accelerate
HEPA
the ______ dehumidifiers are the most efficient to remove bulk moisture from the air
low grain refrigerant
The delta vapor pressure is determined when the atmospheric pressure is subtracted by the ________
vapor pressure within a saturated material.
Negative pressure can cause
Odors and a backdraft of carbon monoxide
Oil based paints are a
Vapor barrier
1 air mover in each room. additional for every _______ SF of floor. And one for every _______ of ceiling and wall above 2 feet.
50-70
100-150
NEC - ____ is the max power on any circuit
80%
Must consider ____ CFM when evaluating grain depression
units
when drying low-porosity materials, the greatest vapor pressure differential is when using a ________
Desiccant Dehumidifier
test a performance of any dehumidification process is to check the _________ using a high quality ______. If the grain depression is a small number, the dehumidifier isn’t removing a lot of water.
grain depression
thermohygrometer
whatever air enters the desiccant it will exit drier from _______
the other side
desiccants perform the best when they are
fed with the coldest air possible
Desiccant airstreams can produce _______ in the drying chamber.
pressure differentials
HEPA is high efficiency particulate air. and is rated at _____. captures particulate larger than ____
99.97%
0.3u
formula to calculate electrical cost is
amps X Volts X 24 / 1000 X cost per kilowatt hour
there is _______ BTU per hour in a nominal ton of air conditioning
12,000 BTU
Electrical appliance heat formula is
A X V = W X 3.4 = BTU per hour
The environment should NOT exceed
70% RH
The first place to inspect on a drying inspection is _________
directly in front of air movers
LGR is 90F / 45% RH. Air leaving is 108F / 19% RH what is the grain depression ?
26.3
What does Grain depression tell you?
rate of humidity removal
Produces the lowest vapor pressure
Desiccants
Desiccants have ____ air streams, and _____ validates its function
2
grain depression
set air movers ____ feet along walls angled at ______
10-16 feet
15-45 degrees
