Plumbing Pipe: This installation would include standard plumbing pipe that is used in the construction of homes for carrying waste water or even supply water. Generally it has an inside dimension (ID) of slightly greater than 2” (50 mm) and is available in 10 foot or 20 foot (3-7 meter) sections.

The advantage is that this pipe is readily available in most countries and can be found at local hardware and plumbing stores. It has a thicker wall and is generally inexpensive as it is mass-produced for various applications.

The disadvantage is that the interior of this pipe is not very critical to the manufacturing process. Generally it is assumed that it is carrying water which weight will easily push any obstructions through the pipe. The wall thickness varies greatly and the joint between the pipe and the fittings normally leaves rough transition points where stiff objects can easily lodge. Because the pipe is also fairly thick, it is normally cut with a chop-saw or hack saw and the edge of the cut normally results in a crooked and/or rough finish. This too creates a strong potential of debris getting stuck. Some retailers have offered a transition fitting for this pipe to mate with central vacuum pipe but one must always be extremely careful when transitioning from a larger pipe back down to a smaller pipe at it will increase the potential for obstructions. No known USA manufacturers of central vacuums recommend this pipe for central vacuum applications and it is not an acceptable standard for installation based upon IAPMO or ASTM F2158 standards.

Flexible Hose: This option was attempted in the early 1960’s with central vacuums and was soon abandoned as a disaster. This method employs a 2” (50mm) flexible hose in lieu of the fittings and elbows in the system. Currently this flexible hose is only used within the first few feet of VacPan locations to allow for more accurate installation capabilities. The hose currently is available in two styles; one as a vinyl material with a wire reinforcement and the other as a more rigid PVC material. Both exhibit the issues listed below.

The advantage is that the installer can reduce his inventory of fittings and the complexity of the installation process. He would simply cut short pieces of the flexible tube any time the installation requires a bend. Some installers have even proposed running the entire system in flexible hose except where one pipe intersects another to add it into the flow. The cost savings is mainly achieved by reducing the skill required for the installer to properly install the system; having a solid knowledge of proper installation techniques.

The disadvantage is that this flexible piping adds a tremendous amount of friction loss to the system. The air bounces as it passed the ridges of the pipe that are intended to flex when the hose is bent. Also in short radius turns, the propensity for a clog greatly increases as sharp pieces of debris could easily lodge in the corrugations of the flexible pipe. This pipe is often much thicker walled to allow for the absorption of the radius of the bends and thus this ledge is accentuated and the smaller diameter of the pipe further increases friction loss. This “ledge” is where debris and long objects can permanently lodge. Because of the unique structure of this pipe, it cannot be cut with a pipe cutter but rather only a saw, again creating additional opportunity for problems. All of this friction loss results in a major decrease in the useable AirWatts of the system. No known USA manufacturers of central vacuums recommend this pipe for central vacuum applications and it is not an acceptable standard for installation based upon IAPMO or ASTM F2158 standards.

Vacuum Tubing: This pipe is made specifically for the central vacuum industry and almost all manufacturers adhere to a strict guideline established by American Standard of Testing and Materials (ASTM) Ruling F2158. This standard was developed by pipe manufacturers, central vacuum manufacturers, installers, and consumers as a means to build consistency into the manner that central vacuums are installed. Most municipalities in the USA have adopted this as a part of the Uniform Building Code (UBC) and building inspectors in these regions have a right to reject any central vacuum installation that does not meet this standard or have this value stamped on the pipe and fittings. This pipe maintains a very concise wall thickness and rigidity to allow for maximum airflow through the system.

The advantage is that it is specifically designed to minimize the potential for clogs in the system. Its thinner wall allows for cost savings but more importantly it exactly matches the thickness of the hub of the fittings; almost creating a bob-sled run inside the pipe wherein there are no potential gaps or crevices. The thin pipe can easily be cut with a special plastic tubing cutter to obtain a precise flat surface each and every time and professional installers also use a pipe reamer to insure that the pipe-to-fitting transitions will not present any possibility of restriction. The thinner wall also bonds more easily to the fittings without the aid of any PVC primers. All currently know back up plates in the industry are designed to fit this size pipe whereas schedule 40 pipes require a special adapter. As of the date of this publication, every central vacuum manufacturer is recommending solely the use of this type of piping over any other of the options.

The disadvantage is that this pipe is not readily available at the local hardware store or plumbing supply house. Because of its limited production, the freight expense to obtain this pipe has become a major cost as part of the system. Countries where central vacuums are not manufactured require even greater costs to import the pipe as the pipe product is not even produced in their country. Some retailers have begun to suggest that the do-it-yourselfer should use one of the other options mainly because it is difficult for even the retailer to handle and work with storing the pipe. In the entire scope of the cost, an average installation may only incur a few dollars of additional cost for the correct pipe.

Conclusion: All central vacuum manufacturers recommend using the proper Vacuum Tubing for very logical reasons.

Show participants have always anticipated that MD would be always presenting new ideas to the industry and this year proved consistent.  Of greatest interest was their new Vacuum Pipe Inspection Camera System.  This very cool suitcase kit contains a 60 foot fiber optic black & white camera system that can be inserted into the piping system to detect clogs, breaks, or any other abnormality in the pipes.  Its infrared lighting illuminates the pipe crystal-clear on the accompanying video screen reducing tons of hours of potential research work.  Simply remove an inlet and start the inspection.  It even contains a battery back-up system when power is not available on the job site.  MD plans an exciting launch of this product for a dealer cost of $499.

Additionally MD displayed a new PetVac kit that allow you to vacuum and groom dogs or cats with an awesome new tool but its fifteen foot hose contains a bleeder valve at the opposite end to keep from disturbing the animal near you.  And they also had a new inexpensive plastic separator bucket system.  Most homeowners rarely need to pick up water but what a convenience when it is needed.  Rather than retailing at over $150, this slick unit will be sold for less than $50.

MD also displayed a new hand-held electric beater brush that will fit right on the end of any electric hose.  No more loud air-driven tools; this one is great for staircases, couches or the interior of your car.  Speaking of small places, MD also displayed their new “MDU” unit for small central vacuum applications.  Measuring in at less that one cubic foot, this quiet, powerful central vacuum can fit inside cabinets, or will work ideal for RV and boat applications.  It’s new Allerex filtration system will also capture an amazing percentage of micro-particles.  MD hopes to introduce this to the market also in the next few months.

The Central vacuum Track of seminars also showed no sigh of the recession;  More than 50 dealers faithfully sat through hours of training including creative marketing techniques, installation helps, existing home installation, central vacuum technical theory and a comprehensive course on service.  Reaction of the participants indicated that this was a highlight of the entire show.

Its unfortunate if you missed the convention but let this be a catalyst to insure that you make a concerted effort to be a part of the show next year.  Overcoming a shifting economy can be far easier with a plan of action different than your historic direction.  We must constantly be making these adjustments or our business will simply be just like the other guy down the street.  So join MD in avoiding this so-called recession!