Frequently Asked Questions
With three different efficiencies of Bard SPVU’s, (Wall Mount), HVAC units, what will my energy savings be?
Every application is different, and as they say in the commercials, “Your Mileage May Vary”. Everyone uses their units differently, and have different costs of power. Nobody sets their temperatures the same, have the same exact building construction, outdoor ambient conditions, or the same utility costs. So let’s make this simple. Bard has three different efficiency SPVU HVAC units. Call them Good, Better, Best. Good is the standard or base unit, set by Federal Govt. Standards. The Better unit is 20% more efficient than the Good. The Best unit is 44% more efficient than the Good. How much are you paying now to heat or cool? Is it $1/day, $10/day, or $100/day? Replacing your existing unit with a Good efficiency Bard unit will most likely improve your efficiency because you currently have a really old unit. Selecting a Better efficiency Bard unit will improve that by an additional 20% greater savings. Going further, selecting the Best efficiency Bard unit will improve your savings by 44% over the Good. It would be fair to say then that selecting the Best efficiency Bard SPVU would easily cut your HVAC energy cost in half.
Can I put a MERV 14 filter in my Bard SPVU (Wall Mount) unit?
A MERV 14 filter is the third most restrictive filter (1-16) rating. It captures 75-84% of .3 micron particles such as diesel particulates, tobacco smoke, sneezes. Regular dust is 3000% larger than .3 microns. A higher MERV rating is better filtration, but it comes with a down side also. When a MERV 14 filter is used in a normal environment it loads up very fast because it collects all the big dust particles and all the small .3 micron particles as well. This isn’t bad, it is just restrictive, and the HVAC unit must be designed to handle this type of resistance to air flow. Most HVAC units on the market today, cannot operate with a MERV 14 filter unless they are specially designed to work against an external static pressure (resistance to airflow) of more than 1” water column of pressure. This resistance also has a significantly greater cost of energy use. Another reason is that most current HVAC units do not have a filter rack that will accept a 4” deep MERV 14 filter. An analogy might be to explain when the filter loads up the resistance to airflow is like trying to blow that air thru a sponge. The sponge seems porous, but won’t let air thru it. If a MERV 14 filtration system is desired, the HVAC equipment must be specifically designed to work against this type of resistance. Standard Bard SPVU’s are designed to work with a MERV 8 filter. MERV 8 filters capture 75% of .3 micron particles such as cement dust. One last decision factor is the cost. In relationship to a MERV 8 filter, a MERV 14 filter is 600% greater cost per filter, and filter change frequency is increased tremendously with a MERV 14 filter.
What does the MERV rating of a filter mean?
The acronym MERV means Minimum Efficiency Reporting Value which was developed by the American Society of Heating, Refrigeration and Air Conditioning Engineers - ASHRAE. MERV values vary from 1 to 16. The higher the MERV value is the more efficient the filter will be in trapping airborne particles.
Remember, as a filter loads up, (collects more and more contaminants), it becomes more and more efficient due to increased surface area to capture contaminant particles.
ASHRAE recommends MERV 6 or higher
US Department of Energy recommends MERV 13
LEED and CHPS recommend MERV 8 at a minimum.
How long does it take to get a Bard SPVU once we order it?
In many cases Geary Pacific will have the unit you need in inventory. Geary Pacific is Bard Mfg’s largest stocking distributor in the world with 1000’s of units in stock. But even then, Geary Pacific may be out of the exact model number you need because Bard has a possible SKU list of over a million possible models. To stock just one of each would not be practical. Geary Pacific stocks what our customers buy on a regular basis. Geary Pacific will also stock product that regular every day customers forecast they will need. Geary Pacific has 16 locations. If one location doesn’t have what you need, another location may have it. So if you are working with a tight schedule this could mean some additional freight charges would apply in order to get your product to you on-time, so always ask about availability or designate a time frame in which you need the equipment. In some cases, certain regional Geary Pacific locations are set up to “upgrade” a standard unit using Bard field installed options to give you just the unit you need for just a small up-charge. Best case scenario, order your Bard SPVU well in advance of actually needing it. Lead times for new orders that are not in stock can vary from 6 weeks to as much as 12 weeks depending upon time of year. Orders for units with coated coils, dehumidification, hot gas, and other specialty options could take even longer. Always tell your Geary Pacific service representative when you need the units so we can provide you the best options.
What kind of ventilation devices does Bard Mfg have for their SPVU’s (Wall Mount) units used on classrooms?
Bard Mfg has three patented, ASHRAE compliant, ventilation devices available for their SPVU product line: Classroom Ventilator (CRV), Economizer (EIFM), and Energy Recovery Ventilator (WERV). Click the link below for information on the three devices.
Which ventilation device should I use to be compliant with California’s Title 24 ventilation standards?
All three of Bard’s ventilation devices will meet or exceed California‘s Title 24 ventilation standards. The Classroom Ventilator (CRV), Economizer (EIFM), and Energy Recovery Ventilator (WERV) offer different solutions at different costs.
The CRV (classroom ventilator) allows for 15 cfm/person, intake and exhaust, of outside air thru the Bard SPVU at the least expensive up-front cost. Energize the CRV by a thermostat, CO2 sensor, Bard energy motor, or DAC system.
The EIFM (economizer) offers free cooling when two conditions are met: the outside air is below 55 deg F, and 50% relative humidity, simultaneously. The minimum outside air potentiometer allows for 15 cfm/person, intake and exhaust, of outside air thru the Bard SPVU. While the free cooling of an economizer sounds like a logical choice, how often are the two simultaneous conditions, below 55 deg F and 50% RH met, when there is a daytime load in the classroom? Additionally, with 32 occupants in a classroom, the minimum potentiometer would need to be set to 480 cfm of outside air. This begs the question…. is an economizer the correct ventilation device for a stand alone 4 or 5 ton HVAC unit on a classroom? A two or three stage cool stat will be required.
The WERV (energy recovery ventilator) allows up to 450 cfm, intake and exhaust, of outside air, reduces ventilation cost by 25%, may reduce the size of the required HVAC unit by 20%, and increases (winter) or decreases (summer) delivered air temp at the register by 20 deg F during ventilation only times. The WERV is the most expensive of the three ventilation devices, but the only one that continues to pay for itself the more it is used. Energize the WERV by a thermostat, CO2 sensor, Bard energy monitor, or DAC system.