Sorry this is long!!
Here is my response of knowledge of several common CenTec power nozzles that have been on various Panasonic, Kenmore, Royal, canisters over the years along with several central vacuum kits! There are some Youtube videos in here too which very well explain some of their newer nozzles!!
The CT24QD blue Intuition nozzle posted above was found on the blue Kenmore Intuition canister vacuum which was manufactured with a universal end hose. The suction unit on that Kenmore was actually very nice. Powerful air flow, long hose, dirt sensor built into the hose handle and all controls including variable speed on the hose handle. The power nozzle was a disaster though!!! Too long, terrible bare floor brush with tiny cheap wheels that broke easy and that cause issues reconnecting back into the power head again.
As far as differences between Kenmore/ CenTec power nozzles, they are very slim with exception of the CT12DX.
The CT12DX is a 12" power nozzle. It was available with and without a headlight. The last canister vacuum I saw it on was the fuscia colored Panasonic MC-CG901 along with some Canadian Kenmore canisters. A decent running power nozzle that has squared off ends. The rear wheels and no handle release pedal allowed this nozzle to tilt back and roll easily around the house from room to room. Also due to the lack of the handle release pedal, the nozzle stays on the carpet better before the the wand getting closer to the floor lifts it up. This nozzle was an unusual center belt design that did get dirt caught around the belt area unfortunately, but that was easily cleanable and took quite a build up before becoming noticeable!! This system was a flat stretch belt. Dual row chevron like brush roll. Easy to turn height adjuster for selection and the foot tension operated handle release. Overall an excellent power nozzle in my opinion that cleaned well, had true dual sided brushed edge cleaning and a pleasant sounding motor.
The CenTec CT14DX is the original. Originally was a cogged style belt, rear wheels were slightly off center on either side of the elbow. They were wide all plastic wheels on metal axles that locked into the housing so the wheel actually spun on the axle and the axle would remain stationary in the housing. Originally this nozzle had a completely smooth front entrance on the bottom plate and only 2 rug guards. Original brush roll consisted of a beater bar and rows of soft replaceable brush strips. Modifications over time have allowed for airflow inlets on the front of the nozzle base plate, more rug guards, and a chevron brush roll. The headlight cover is easily knocked off on these units. The sound of the cogged belt motor is louder than many other power nozzles and the tone in my opinion is unappealing!
Next came the CT18DX. This originally debuted on first generation Kenmore Progressive canisters. It is a squared off nozzle on either side, with very thin all plastic rear wheels. Serpentine belt is significantly quieter and more pleasant toned over the CT14DX. There is a white plastic guard inside the machine that encloses the brush roll cavity. Just an extra piece inside the unit aside from the main housing. This is the power nozzle found on current market Panasonic MC-CG902, MC917 and a few others. Wheels can wear away housing.
CenTec CT20DX is the nozzle found today on most Kenmore canisters such as the lime green, tangerine, white and blueberry models. A sleeker, lower profile head over the 2 previous mentioned power nozzles. The rear wheels are rubber or other texture coating that glides better over hard floors. This a T designed head that allows a little better reach into certain crevices. The coated wheels maneuver well. Serpentine belt system with identical motor sound and I believe the exact same brush roll as the CT18DX. These wheels have a tendency to get worn and rock over time as dirt erodes the plastic axles. But they do work well up until that point as the rubberized traction is great over their previous power nozzles.
New to the market is the CenTec CT23QD also known as the Response II. This nozzle is a very sleek, has a headlight is again 14" wide just like CT14, CT18 and CT20 models. This nozzle has vents in the side that make it more versatile for newer style softer fiber carpets. This youtube video by Panasonic explains it best and makes it look quite impressive. I would love to try one myself and perhaps someday own one!! [MEDIA=youtube]XMIx_BMTcsE[/MEDIA]
Also new to the market is the CT10QD power nozzle. This nozzle is a very compact barefloor/ low profile carpet power nozzle. it can be used in various positions. The front opens up to allow the brush roll to completely clean up against base boards, and other things. The Youtube video for this is impressive. I don't know exact width of the nozzle or durability but they look neat, and are very quiet. Very soft bristles primarily are what market this as a barefloor nozzle and the lightweight carpet. [MEDIA=youtube]Rl7g1usF-w8[/MEDIA]
