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Nowadays going on YouTube is obligatory. :D

Now that you have several candidates, you can run cost calc's on these so that some stand out as clear winners and some as clear losers. Doing this upfront shows Due Diligence and Duty of Care, etc..

No, you need formulas so you can do your own install cost/install labor/end performance tradeoffs. They may not be easy to get and everything is non-linear. It's worse than electrical engineering. For ducting there is a Total Equivalent Length for pipes and fittings other than a short...

The auto makers coat the large sheet metal parts in luxury cars with absorbent foam or rubber. And, heavy curtains and heavy rugs will acoustically deaden the room. Without test equipment, the experiments you run to isolate the sources will have to be pretty cleverly designed. You also need...

If the screw head is large enough you can pin it with a brad to prevent rotation. There are also threaded inserts that present a large wood screw thread to the jamb and a machine screw thread to the hinge screw, which is now a machine screw. Then you use Loktite to secure the machine screw.

With 150W into 8 ohms they are probably >60 vdc.

Post your definition. Cowboy? I'm flattered! :D

Maybe it's this http://en.wikipedia.org/wiki/Dumping_(pricing_policy)

Using calculators on the Engineering Toolbox site you can probably quantify the improvement but there are also homeowners' perceptions and maybe it is good practice to allow some headroom in case the effective pipe ID decreases over time.

Increasing cable insulation leakage current due to a water leak is tripping your RCD in less and less time?

Your suspension spring has been damaged, shortened or work-hardened by the impact?

A window is like a diaphragm that picks up outside sounds. To see how much of the outside noise is being picked up by your windows, have someone make a steady noise outside, like a car horn, and then press on the glass center with your hand while someone else notes a change in interior sound...

"Type B MCBs at £1.80 +vat etc. " If you collect prices for similar sized breakers by reputable makers and this price is less than the top 75% of quotes, I wouldn't buy them. Money talks.

Here's some spec's for the disease mentioned by OwainDIYer - "These species can be water-borne or present in soil, whereas L. pneumophila has only been found in aquatic systems, where it is symbiotically present in aquatic-borne amoebae.[2] It thrives in temperatures between 25 and 45 °C (77...

A strong clue that says your filter caps (likely those big black 8200 uF units) have greatly diminished in value or maybe their solder joints have failed to a high resistance value. You need an oscilloscope to check power supply ripple but you may be able to check this with a true-RMS AC...

Which would put the filter cap voltages at 30vdc or slightly more and at +10% high mains voltage the alarm filter cap voltage may be 35vdc.

The demand factor for installations like this must be well known. Once you know your spec limits you can run a cost analysis for candidate options that meet all or most of your spec's, upfront cost and likely maintenance costs.

Help the OP if you can. Otherwise post some volumes & power levels of catalog transformers of the type used in alarm systems and I will tell you how closely power tracks volume. It all comes down to how close you need to be in sizing this device. BTW, I talked to some lawyers where I work...

A search on "class action" Raytech seemed unproductive. You could ask for Mean Time Between Failures data but probably no maker of anything will supply this because early failures are a hidden cost of ownership and with this info consumers could make informed buying decisions. Some...

Or the door is too heavy or too wide. With any door, the top hinge tends to be pulled out and the bottom hinge tends to be pushed in.