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898 CHAPTER 43 1950 Guide Low A vg H igu Low A vg H igh Low H igh $700 400 400 400 CKM Supply A ir . A VG $2.75 1.00 0.90 1.00 Xu X & %o P $ a 52Cl. s < Ci 55 O H JoCata5O X < < id 2 s OOoolOt- Ooo ^dod mooo CB o c o doo w $500 800 400 $0.75 0.75 $1.05 1125 $1.50 2.50 $1.00 0.95 $0.65 $1.00 $1.25 O S'I O S'IS i: ! o j jo |' t*. joo o i ;d S ;i j 00*0*00 OO CiOO OCdOOCl lOO an ' o o' 2 *Mgw 3Ts3 . 8 " |*E8g 18J3 OvCv2a m. TOc3 .4 = S fJsa-i.sS OS O 0 ^ g, 8 Si a .El^S Oto * OlClCO OOCdCd lO co co co 60 O1CO5OC1d0O(1N0OC0O CO *000 Is- LQ 00 CO^Od 0Cd0000iO*0Cd r* H CO $320 100 80 100 0^0Tj<0TJ*< 0 0U5U50 OO Cd Cd CO 9 &IOOOO owooH - v $3.50 1.15 1.25 1.10 $2.00 1.00 1.05 0.90 UCOJOO'SO* $1.25 0.60 0.60 0.60 G . =; 'e^8& iV-S3) teO--. BoC- r-a J 3il| ["II v. 4 s oeies ffiOOi* $1.25 1.75 2.20 $2.00 3.25 3.50 $240= 110 110' 15 $300 300 215 $1.50 1.25 1.25 0.90 0.95 $4.00 2.00 2.00 2.80 1.75 O0*N0*N0N0*N0 ^tnodododcd *00000 Cd CO Cd CO COCdCdCdCd & 0>0*N0*N0**00*00 60 . OiOiOCOO COiOCOTJ* 55 o *o *05 OJ *o *0 Tj* ^ Cd CO ooooo to *0 to C-d Cd NHHHH . 69 ,,W cu >* CQ v OQ. ntXnvkV .U5c5)*5o? 2b;"-co/o* fisS^g PrtOJQr JQr U.W * m *3 o uj: gy> in $215 $300 '<`t F2t"6o- a *5*1 oi | >.3C? o iSas iia'cosarn2Hes6 E8S& co Cd 2 - at 8 ** i-ss-* g-SlSco ".OS'OS o . to a o go2 . ili25S5^5 12H o co 9 o g*'=SSsj 4 i g-O 3 i-|S| J J js , 8 S 0 sS-Ss " s|i j C sS-sgssil 3 2%H | I ll * "a"-s . 2 1 i 2-S-S8& i.jigg sfsa-s6-=i "S o e~ g-=8sls ee a|-o - s SVS ig3~5wgSS?=OC" * 2gJls --s .s2 sk2ggh s** g TsfjOgii c-o S*o cr . y2a H= t: 1 *isH g I a SSjI'g s v sXSiSas s g-a Ss g g O JaS-S-a s -S-T: <S3i! Owning and Operating Costs 899 less may be proper, whereas for larger installations in buildings that are owned outright, a period of 10 or 20 years or more may be used. Depreciation due to deterioration and obsolescence must also be con sidered in arriving at the amortization period. Deterioration and mainte nance generally go hand in hand. If a long depreciation period is to be Table 5. Approximate Lies of Equipment (Including Obsolescence and Deterioration)* 1. Heat Producing Equipment 2. Heat Distributing Equipment 3. Air Handling Equipment 4. Air Distributing Equipment Lifb in Years 15 . 10 20 10 12 10 5 8 10 10 10 10 15 8 10 8 20 20 10 5. Refrigerating Equipment 6. Water Saving Devices US WpIU " 15 10 20 15 15 10 10 Varies Widely * Modern Air Conditioning, Heating and Ventilating, W. H. Carrier, R. E. Charne and W. A. Grant (Pit* man Publishing Carp. 1940, p. 66). used, then the item for maintenance, repair and replacement of wearing parts must be greater than for a short depreciation period. Obsolescence depends mainly on time required for the equipment to become out-moded. Air conditioning, particularly, would probably suffer more from obsolescence in small plants than in large establishments. In addition the obsolescence of the building or property in which the equip ment is installed may have a similar effect upon the equipment.