Abstract: The present heating, ventilation and air conditioning (HVAC) air conveyance apparatus is plurality of panels adapted to be field-assembled to form the conveyance apparatus. These panels include a pair of first quadrilateral panels, each defining a right-angle flange extending from each of a pair of opposite edges and a pair of second quadrilateral panels, each defining a hemmed cleat along each of a pair of opposite edges. Each hemmed cleat is shaped and dimensioned to receive one of the first quadrilateral panel right-angle flanges to form the HVAC air conveyance apparatus. Also, HVAC unit mating flanges extending from each other edge of each of the first quadrilateral panels and/or from each other edge of each of the second quadrilateral panels, such that at least a pair of opposed peripheral HVAC unit mating flanges extend from each end of the HVAC air conveyance apparatus.

Abstract: The present heating, ventilation and air conditioning (HVAC) air conveyance apparatus is plurality of panels adapted to be field-assembled to form the conveyance apparatus. These panels include a pair of first quadrilateral panels, each defining a right-angle flange extending from each of a pair of opposite edges and a pair of second quadrilateral panels, each defining a hemmed cleat along each of a pair of opposite edges. Each hemmed cleat is shaped and dimensioned to receive one of the first quadrilateral panel right-angle flanges to form the HVAC air conveyance apparatus. Also, HVAC unit mating flanges extending from each other edge of each of the first quadrilateral panels and/or from each other edge of each of the second quadrilateral panels, such that at least a pair of opposed peripheral HVAC unit mating flanges extend from each end of the HVAC air conveyance apparatus.

Abstract: An air conditioning system includes an air handler, an evaporator coil, a blower and a heater all within the air handler. The system further includes an air filter and a transition between the air handler and the air filter. The transition includes at least four panels that together define a perimeter and an interior of the transition. A first end of the transition is configured to be attached to the air handler. A second end of the transition is opposite the first end, and an air filter is disposed at the second end. At least one of the at least four panels includes an access door that opens to allow access into the interior of the transition. A method includes positioning the first end of the transition at a first end of the air handler, and positioning the air filter at the second end of the transition.

Abstract: Methods and systems are disclosed with regard to a transition used in air conditioning systems. One embodiment may include an AHU, which may include a furnace, a motor and a blower. Further, the system may include a transition having at least one removable access panel, wherein the transition has a first opened end and a second opened end located opposite of the first opened end, wherein the first opened end securably aligns with an opened end of the furnace. Further still, the system may include a housing unit housing evaporator coils, wherein the second opened end securably aligns with one opened end of the box, further wherein the evaporator coils and the heat exchanging components of the AHU are accessible via the removable access panel.

Abstract: Methods and systems are disclosed with regard to a transition used in air conditioning systems having box evaporator coils. One embodiment includes a method for accessing box evaporator coils. The method may include opening an access panel located on a transition having a first opened end and a second opened end located opposite of the first opened end, wherein the first opened end securably aligns with an opened end of a furnace, and the second opened end securably aligns with one opened end of a box housing the box evaporator coils. Further, the method may include extending a member through the access panel for interacting with the box evaporator coils.

Abstract: Methods and systems are disclosed with regard to a transition used in air conditioning systems. One embodiment may include an AHU, which may include a furnace, a motor and a blower. Further, the system may include a transition having at least one removable access panel, wherein the transition has a first opened end and a second opened end located opposite of the first opened end, wherein the first opened end securably aligns with an opened end of the furnace. Further still, the system may include a housing unit housing evaporator coils, wherein the second opened end securably aligns with one opened end of the box, further wherein the evaporator coils and the heat exchanging components of the AHU are accessible via the removable access panel.

Abstract: Methods and systems are disclosed with regard to a transition used in air conditioning systems having box evaporator coils. One embodiment includes a method for accessing box evaporator coils. The method may include opening an access panel located on a transition having a first opened end and a second opened end located opposite of the first opened end, wherein the first opened end securably aligns with an opened end of a furnace, and the second opened end securably aligns with one opened end of a box housing the box evaporator coils. Further, the method may include extending a member through the access panel for interacting with the box evaporator coils.

Abstract: A process is disclosed for preparing alkyl glycosides of general formula (I), by reacting an alcohol with a reducing sugar or with an equivalent of the latter, in the presence of a binary catalyst formed by a strong organic acid and a weak, also organic, base, having a K.sub.a within the range of from 10.sup.-8 to 10.sup.-1.

Abstract: A process for the preparation of a pyrazine derivative of the formula ##STR1## wherein R.sub.1 represents hydroxy, C.sub.1 -C.sub.6 alkoxy, or a group of the formula NR.sub.2 R.sub.3 in which R.sub.2 and R.sub.3 are independently a hydrogen atom or C.sub.1 -C.sub.6 alkyl or, together with the nitrogen atom to which they are linked, form a saturated ring having five or six atoms which may contain one or more additional heteroatoms; which process comprises reacting a compound of the formula: ##STR2## wherein R represents a hydrogen atom, C.sub.1 -C.sub.6 alkyl, or C.sub.1 -C.sub.6 alkoxy, Y represents a hydrogen atom or a sodium, lithium, or potassium ion, and A is a nitrile group or a substituent of the formula COR.sub.1 where R.sub.1 is as defined above either with pyruvic aldehyde oxime of the formula: ##STR3## or with a pyruvic aldehyde oxime acetal derivative of the formula: ##STR4## wherein R.sub.4 and R.sub.5 are independently a hydrogen atom or C.sub.1 -C.sub.

Abstract: Alkyl diesters of saturated dicarboxylic acids are prepared by catalytic reaction of olefinic hydrocarbons with carbon monoxide and alkoxylic copper salts, in the presence of a Palladium catalyst.The products obtained find useful applications in the field of plasticizers for synthetic resins, in the field of lubricants and of hydraulic fluids, etc.